Seven years ago, German authorities arrested Klaus O., an employee at a metal fitting company in Northwest Germany. A coworker had noticed white powder on his ham and cheese sandwich and alerted superiors. Security footage revealed that Klaus had added the substance. What initially appeared to be a poorly planned practical joke escalated into an attempted murder investigation when authorities discovered the powder was lead acetate, a nearly tasteless, highly toxic substance that could cause organ damage.

When police searched Klaus’s home, they found a basement laboratory filled with substances used to make poison: mercury, lead, and cadmium. The 56-year-old suspect had worked at the company for 38 years. Authorities formed a 15-member homicide squad to investigate the deaths of more than 21 employees who had died over an 18-year period beginning in 2000. At the time of his arrest, two other employees were in comas and another was undergoing dialysis.

Klaus was eventually sentenced to life in prison. One victim, a 26-year-old man who had been in a coma for four years, later died from poisoning. At the trial, one victim whose sandwich had been poisoned was asked why he didn’t start locking up his lunch. He responded, “Nobody believes that a colleague would do something like that. We trust each other.” Klaus’s manager described him as a man who was “conspicuously inconspicuous.”

This chilling account illustrates a spiritual reality that every believer must understand: the enemy is subtle and “conspicuously inconspicuous” in seeking to poison and lead astray. Just as Klaus worked alongside his victims for decades before his deadly intentions were discovered, false teaching often comes from those who appear trustworthy and familiar.

The Epidemic of Spiritual Deconstruction

In our contemporary culture, this departure from faith is often called “deconstruction.” The phenomenon has claimed notable figures who once stood prominently in Christian circles. Josh Harris, who wrote “I Kissed Dating Goodbye” as an 18-year-old, became the lead pastor of Covenant Life Church in Maryland at age 29. He was considered an evangelical wonder boy. Yet about ten years ago, he left his church, later divorced his wife, and finally announced that he no longer considered himself a Christian. A major Christian magazine covered his deconstruction in a podcast titled “I Kissed Christianity Goodbye.”

Similarly, Rob Bell, who pastored Mars Hill Bible Church in western Michigan and was listed by Time magazine as one of the 100 most influential people in the world, began his own deconstruction. He started questioning fundamental doctrines like hell, embracing uncertainty as more desirable than scriptural confidence, and promoting universal reconciliation as an acceptable Christian view. John Piper responded to Bell’s drift with a succinct three-word tweet: “Farewell Rob Bell.”

Even more heartbreaking are the cases that hit closer to home. Abraham Piper, son of John Piper, rejected the faith at age 19, was later restored to church membership, but again rejected the faith. He now creates videos critical of Christianity that have garnered millions of likes, mocking what he was once taught.¹

These examples could be multiplied with lesser-known individuals who have similarly abandoned the truth they once professed. The pattern is consistent and troubling, yet entirely predictable according to Scripture.

The Characteristics of Wrong Teaching

The Apostle Paul warned Timothy that “in latter times some will depart from the faith, giving heed to deceiving spirits and doctrines of demons.” This departure doesn’t happen in a vacuum. False teaching has identifiable characteristics that every believer must recognize.

It Leads People Astray

The Holy Spirit speaks expressly and clearly about this reality. People will depart from the faith. The word “depart” gives us our English word “apostasy,” referring to someone who willfully abandons the truth they once professed. This describes a willful, deliberate withdrawal from the faith by someone who rejects Christ. It doesn’t mean they lose their salvation; rather, it indicates they never had true salvation. They professed what they did not possess, wearing a mask of faith.

When does this happen? We live in those “latter times” right now. According to 1 John 2:18, believers have been living in the latter times since the apostolic era. This means the danger is present and persistent.

It Springs from Demonic Doctrine

The root of doctrinal error is demonic teaching. Those who fall away pay attention to “deceiving spirits and doctrines of demons.” This doesn’t refer to teaching about demons but rather teaching that has its source in demons. Wrong doctrine, error, and falsehood always begin with the father of lies. The poisoning of doctrine begins in the basement laboratory of the devil.

All false teachings, regardless of how different they appear on the surface, share the same father. To give ear to false doctrine that contradicts the Bible is to be taught by demons. The source is demonic, but the means is human. Demons don’t deny truth outwardly; instead, they sprinkle poison on top of a meal of spiritual truth.

It’s Taught by Duplicitous Deceivers

False teachers are “speaking lies in hypocrisy.” They’re lying fakes who don’t advertise what they truly believe. The term “hypocrite” originally described an actor who wore a mask while playing a part on stage. The audience knew they were playing a role. Today’s false teachers wear masks, but we don’t always realize they’re acting.

False teachers wear whatever mask is necessary to gain a better hearing. In our age of relativism, one of the most valuable masks is uncertainty. Josh Harris exemplified this when he said, “I used to have all the answers, chapter and verse. Now I am happily uncertain.”²

Our culture finds something appealing about this kind of intellectual humility, even when it’s rebellion against clear biblical truth.

Similarly, Rob Bell argued that evangelical Christianity’s views of gender, marriage, heaven, and hell seemed “a very narrow, politically intertwined, culturally ghettoized evangelical subculture.”³ He promoted the idea that Jesus focused on God’s ongoing restoration of this world rather than getting individuals to heaven. Such teaching sounds compassionate and broad-minded, but it contradicts the clear biblical truth that Christ Jesus came into this world to save sinners.

It Rises from a Cauterized Conscience

False teachers have “their own conscience seared with a hot iron.” The word “seared” gives us our medical term “cauterized,” describing the technique of burning part of the body to stop bleeding or close a wound. These teachers have done this to their conscience, creating insensitivity to truth.

This doesn’t mean they’re branded with Satan’s mark, but rather that something is fundamentally wrong with their conscience. They’ve resisted the truth in some area to the point that it no longer bothers them. When a person can actively, willfully sin and disobey God’s word while claiming it doesn’t bother them, that reveals nothing about God’s word but everything about their condition.

The danger extends beyond personal consequences. A person who is comfortable living different lives in different settings, who is one thing at home, another at work, and yet another at church, is on dangerous ground. A hypocrite is someone who pretends to be what they never intend to be. When you persist in sin, you become insensitive to the convicting work of the Holy Spirit. When you’re insensitive to the Holy Spirit’s work, you become susceptible to false teaching.

It Prohibits What God Has Provided

Interestingly, the specific false teaching Paul addresses doesn’t involve denying major doctrines like the Trinity or the deity of Christ. Instead, the false teachers were “forbidding to marry and commanding to abstain from foods which God created to be received with thanksgiving.” (1 Tim 4.3) They prohibited marriage and certain foods, possibly viewing marital intimacy as ungodly or believing that asceticism was more noble than enjoying legitimate pleasures.

This pattern has appeared throughout church history. Early Church Fathers like Tertullian and Ambrose believed that the extinction of humanity was preferable to sexual relationships in marriage. The dominant attitude of the Catholic Church in the Middle Ages was that sexual love, even with one’s spouse, was evil. The Council of Trent declared virginity superior to marriage and added so many prohibited days for intimacy that half the year was excluded.

The problem with such false systems is that limiting what God has provided as beautiful and good does not advance godliness or righteousness. While individuals may choose to limit certain foods for health reasons or exercise personal discipline, they don’t have the right to make everyone else follow those restrictions.

It Demonstrates Arrogance and Ingratitude

Rejecting God’s gifts when He has made them available assumes we know better than God. Paul reminds us that “every creature of God is good and nothing is to be refused if it is received with thanksgiving, for it is sanctified by the word of God and prayer.” (1 Tim 4.4)

God has created all things for us to enjoy. While we can corrupt what God has provided in our fallen state, humility keeps us seeking God’s will and drives us to pray that whether we eat or drink or whatever we do, we do all to the glory of God.

Guarding Against Wrong Teaching

Understanding the characteristics of false teaching is only the first step. Every believer must actively guard against being led astray. This requires intentional spiritual disciplines and practices.

Know the Truth

You guard against being led astray by being devoted to the truth. Paul refers to “the faith,” that body of truth once delivered to the saints. The entire book of Jude addresses this same concern.

The question every believer must answer is: Do you know God’s word? Are you in God’s word faithfully and regularly, meditating upon it day and night? This is the Psalm 1 blueprint for being blessed and stable. You cannot be influenced by what you don’t know, so believers must guard their faith and thus guard the flock of God.

How much deviation from the truth of God is acceptable? This doesn’t refer to minor points of disagreement where there are legitimate questions of clarity, but to areas where God’s Word is clear. Violation of God’s word is never acceptable. God’s word is the only reliable standard for faith and practice.

Sometimes protecting truth requires rocking the boat. Some boats are made to be rocked when it comes to protecting biblical truth. When we expose ourselves, our friends, or our children to false teachings, we place them in an environment where demons are doing their seducing work.

Maintain a Clear Conscience

The only safeguard to right belief is a clear conscience. Sensitivity to right and wrong, truth and error, integrity and hypocrisy is vital. When we examine our lives and recognize areas that need change, we must confess our sins, knowing that God is faithful and righteous to forgive and cleanse us.

When the Holy Spirit convicts, deal with it immediately. Don’t rationalize or postpone, thinking it’s not that big a deal. If the Holy Spirit is convicting, it is a big deal. If unbiblical behavior doesn’t bother us or someone else, that indicates a seared conscience that has developed scar tissue without sensitivity.

When we don’t sense the Holy Spirit’s conviction in areas we know are wrong, we need to pray for God to quiet our hearts, convict us of sin, and sensitize our conscience. This requires getting out of worldly entertainment and into the Word.

Acknowledge God as Creator

God is the source of every good gift. James 1:17 reminds us that every good gift and every perfect act of giving comes from the Father above. God delights to give His children every good gift, providing all things for us to enjoy so we can eat and drink and do everything to His glory.

Marriage is a picture of Christ’s relationship with His bride, the church. Food is given for enjoyment but also as a reminder of our dependence on God: “Give us this day our daily bread.” Martin Luther said that everything necessary for life is bread, and we need it daily.

Cultivate Thankfulness

Guard against being led astray with a heart of thanksgiving, determined to thank God perpetually. Since marriage and food are given by God, we should thank Him for them. If we don’t thank God for His good gifts, how are we any different from the unsaved?

Thanksgiving directs our thoughts toward God, brings our hearts into agreement with Him, and causes us to respond in adoration. This is why many churches sing the doxology: “Praise God from whom all blessings flow, praise Him all creatures here below.”

Develop a Pattern of Prayer

Prayer acknowledges that what we have received comes from God. When we eat, we should pray, thanking God for the food. This isn’t merely for protection but for acknowledging God’s provision and expressing thankfulness.

These moments of prayer throughout the day help sensitize us to God’s goodness. We can become ritualistic, praying and thanking God for food while grumbling about it, but God isn’t honored when we take Him for granted.

Most believers don’t really have to pray “give us this day our daily bread” because refrigerators and cupboards are full, and grocery stores have stocked shelves. Yet we should thank God for what He’s given, recognizing that we are blessed people in a nation with freedom. There are places in the world today where people don’t have the freedoms we enjoy, where Christians face persecution for their faith.

One thing that protects us from false teaching is humility and thankfulness. If our standard of living wasn’t so high, would we seek the Lord more often?

A Personal Call to Action

The question each believer must answer is: What are you doing today to protect right teaching in your life? We must be on guard, recognizing that satanic instruction and demonic doctrine don’t come with pitchforks and horns. They come in smooth ways, with a little something sprinkled on the food of truth.

Are you spending time with God? Are you in His Word faithfully? Do you know Him personally? Has there been a time in your life when you’ve turned from sin and trusted Christ as your personal Savior?

Don’t let the poison of our culture, this world, or wrong teaching deaden your delight in the Lord or destroy your soul. Let your life be set apart by knowing the Word and developing a pattern of prayer. Every believer has an obligation to know God’s Word and guard against deviation from the truth. This isn’t just the pastor’s job or the church staff’s responsibility. It’s the job of every believer because the church is the pillar and ground of the truth.

The enemy works subtly, like Klaus in that German factory, appearing trustworthy while slowly poisoning those around him. But unlike those unsuspecting coworkers, believers have been warned. We have the tools to recognize and resist false teaching. The question is whether we’ll use them faithfully, protecting ourselves and those we love from the deadly poison of doctrinal error.

In a world where spiritual deconstruction is celebrated and uncertainty is praised as wisdom the church must stand firm on the truth of God’s Word. We must be discerning, grateful, and grounded in Scripture. The stakes are too high, and the consequences too devastating, to do anything less.

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Ken Endean is the pastor of Tri-City Baptist Church in Chandler, AZ. This article reproduces a sermon preached on July 6, 2025, which you can listen to here. We used Claude.AI to turn the transcript into the article. Pastor Endean has reviewed and approved the final form of this article.

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Photo by T D on Unsplash

1. Sources for this story: https://www.nytimes.com/2019/03/08/world/europe/poisoned-german-worker-sandwiches.html. and https://www.dw.com/en/german-man-suspected-of-killing-21-co-workers-by-poisoning-their-food/a-44427747. Accessed 07/03/25. [↩]
2. https://www.christianitytoday.com/wp-content/uploads/2021/08/22914.pdf. Accessed 07/05/25. [↩]
3. Rob Bell – Wikipedia [↩]