“For I know this, that after my departure savage wolves will come in among you, not sparing the flock.  Also from among yourselves men will rise up, speaking perverse things, to draw away the disciples after themselves.” Acts 20:28-30

We are warned by Paul that there are going to be those amongst us that Will try and deceive those that are following Christ. The way to avoid this kind of deception is to trust in the Lord and His word.