Paul - What does the Bible say about false converts ? I will share some of the verses with you, in case you don't have one.

Mat 7:21-23  “Not everyone who says to me, ‘Lord, Lord,’ will enter the kingdom of heaven, but the one who does the will of my Father who is in heaven.  (22)  On that day many will say to me, ‘Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?’  (23)  And then will I declare to them, ‘I never knew you; depart from me, you workers of lawlessness.’

Titus 1:16  They profess to know God, but they deny him by their works. They are detestable, disobedient, unfit for any good work.

Jude 1:4  For certain people have crept in unnoticed who long ago were designated for this condemnation, ungodly people, who pervert the grace of our God into sensuality and deny our only Master and Lord, Jesus Christ.

I am sure you will throw this on me for being "judgmental", but this is what the Bible says.