The truth of Bible Prophecy protects us from the deception of false teachers. Jesus, Paul, and the Apostle Peter teach about the reality of those who would want to deceive us.
For false Christs and false prophets will arise and will show great signs and wonders, so as to mislead, if possible, even the elect. (Matt. 24:24)
But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons. (1 Tim. 4:1)
But false prophets also arose among the people, just as there will also be false teachers among you, who will secretly introduce destructive heresies, even denying the Master who bought them, bringing swift destruction upon themselves. (2 Peter 2:1)