In Matthew 7:15-20 we are told, "Watch out for false prophets. They come to you in sheep's clothing, but inwardly they are ferocious wolves. By their fruit you will recognize them. Do people pick grapes from thornbushes, or figs from thistles? Likewise every good tree bears good fruit, but a bad tree bears bad fruit. A good tree cannot bear bad fruit, and a bad tree cannot bear good fruit. Every tree that doe snot bear good fruit is cut down and thrown into the fire. Thus, by their fruit you will recognize them. In other words, someone may look, walk and talk like a Christian but we are not to take their word for it but measure their actions against their claims. Are they really bearing the good fruit?
Deceivers mislead the Christian faithful.
Deceivers teach an unbiblical doctrine that amongst other things tells us that we can be our own god and have no need for the one true God. This is not so. We were all created to have an intimate relationship with our creator. However, many times it will mean that we will sacrifice certain things in our life in our pursuit of God. Perhaps we will have to give up some unhealthy relationships, give of our time, and even give away some of our money to those who may need it. However, in the end we will be able to say, "I have fought the good fight, I have finished the race, I have kept the faith." I couldn't imagine striving to say anything else at the end of my life. How about you?
18Dear children, this is the last hour; and as you have heard that the antichrist is coming, even now many antichrists have come. This is how we know it is the last hour. 19They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us.
20But you have an anointing from the Holy One, and all of you know the truth. 21I do not write to you because you do not know the truth, but because you do know it and because no lie comes from the truth. 22Who is the liar? It is the man who denies that Jesus is the Christ. Such a man is the antichrist—he denies the Father and the Son. 23No one who denies the Son has the Father; whoever acknowledges the Son has the Father also.
24See that what you have heard from the beginning remains in you. If it does, you also will remain in the Son and in the Father. 25And this is what he promised us—even eternal life.
I am writing these things to you about those who are trying to lead you astray. As for you, the anointing you received from him remains in you, and you do not need anyone to teach you. But as his anointing teaches you about all things and as that anointing is real, not counterfeit—just as it has taught you, remain in him.
-1 John 2:18-27