How Can You Tell?

 

1 John 4:1(NKJV)

1Beloved, do not believe every spirit, but test the spirits, whether they are of God; because many false prophets have gone out into the world. 

So how do we tell?  Simple.  Love it when God makes it simple. 

1 John 4:2-3(NKJV)

2By this you know the Spirit of God: Every spirit that confesses that Jesus Christ has come in the flesh is of God, 

3and every spirit that does not confess £that Jesus Christ has come in the flesh is not of God. And this is the spirit of the Antichrist, which you have heard was coming, and is now already in the world.

Makes it easy doesn't it?  Test the spirit.  Simply ask.  If it tries to give you a weasley answer instead of immediately confessing Jesus then you have your answer!