If you are standing under a tree and all you see are apples on the ground, you can be assured that the tree is more than likely an apple tree. A tree cannot throw it's fruit to disguise what fruit it will produce. There is no deception if you really look.
The bible tells us to judge (yes I said it) each person by the FRUIT it produces. The FRUIT of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control." Galatians 5:22-23
The bible also tells us what is also very obvious. Now, the effects of the corrupt nature are obvious: illicit sex, perversion, promiscuity,idolatry, drug use, hatred, rivalry, jealousy, angry outbursts, selfish ambition, conflict, factions,envy, drunkenness, wild partying, and similar things. I've told you in the past and I'm telling you again that people who do these kinds of things will not inherit the kingdom of God. Galatians 5:19-21
Therefore, if you have any question about choosing who to follow, I would suggest taking in account what FRUIT are around him or her. As stated before deception only fools you if you choose not to see what is obviously right on the ground around them.