In response to Ushan:
Not if you're a good soldier. If you've ever heard the story of St. George (the real one, not the one about dragons), then you'd know that he was givin three chances to convert to the roman religion, he even in the end said he didn't actually have to convert, just say that he would, before he was executed, because he was a good soldier.
[Edited on 12.18.2012 3:28 PM PST]