Crypto-Atheists

The idea scares the hell out of me: namely, that
one of the people in my congregation is an Atheist
masquerading as a Christian for social advantage
(or sexual advantage, for that matter).

Is there some tried and tested method that allows me
to determine whether or not a person is a true believer?

>>16
Fun facts:
1. Lenin was protestant (his mom was german lutheran)
2. Hitler was protestant
3. Karl Marx was protestant
4. Hitler and (initially) Stalin were pro-Israel

protestants are commie nazi kikes