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?

>>19
Except for the fact that you are the one who commits the fallacy I have to say that you are right

1. Hitler was communist
2. Lenin was a nazi
3. Karl Marx was a nazi
4. Stalin was a nazi

Yes, Hitler was a Communist (National Socialism or anything that has to do with Socialism is Comministic)
Yes, Lenin, Karl and Stalin were nazis, their actions were equaliy bad as hitler's