Beloved, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.(From 1 John 4:1)
Our best bet? Read; be familiar with the scriptures; able to recognize the untrue and the untruthful and the outright lies.
When a prophet or visionary gets up in your community and gives out a miracle-sign or wonder, and the miracle-sign or wonder that he gave out happens and he says, “Let’s follow other gods” (these are gods you know nothing about), “let’s worship them,” don’t pay any attention to what that prophet or visionary says.
God, your God, is testing you to find out if you totally love him with everything you have in you. You are to follow only God, your God, hold him in deep reverence, keep his commandments, listen obediently to what he says, serve him—hold on to him for dear life!(Deuteronomy 13: 1-4, MSG)
Are you holding on to God for dear life or is he just your casual acquaintance?