Debate Tips: Was Hitler a Christain?

So you're on a forum or a social network, minding your own business, when the unthinkable happens.  A religious discussion breaks out.

Before long, somebody just has to mention the Crusades.  It always happens.  But then, right after the old and worn-out "Crusades-were-bad-so-religion-is-bad" argument, comes a different argument.  One you may or may not be familiar with.  An argument that some people (including me) have a hard time believing exists.

"Oh yeah?  Well, Hitler was a Christian!"

What?  Are you kidding me?