In Wisconsin talking about religion in the workplace is not allowed. I don't know if that's at every company, but that was the rule at every company I've worked for.
The Jehovah's witnesses main building (the only one with a pointy fence) is two blocks from my house. I've had contact with them three times in six years. They leave me a copy of the Watch Tower for my amusement.
Your best debate tool with your roommate is debunking the bible. It's your roommate's only source of "knowledge". Show the errors, and the rest should follow like dominoes (hopefully). Either that, or get another roommate!
People usually become very angry when you confront their beliefs, sometimes is better to scold their mothers than talk that their religions are wrong. I guess that they considers a personal insult if you don't agree with their faith.
Religious people don't bother with logical arguments, they just wanna know what their priests (or minister) have to say about certain subject
"Sorry for my bad English, I have to practice more"
Practice? Why? It's fine.
I feel so sorry that you have to put up with such CRAP. I wish he'd just keep his frickin' mouth SHUT! :-(
I remember being in elementary school (a LONG time ago) and having to sing in Christmas concerts, and singing "Cheesy Kites" instead of "Jesus Christ", because it was so offensive to me. So I'd rather call him "Cheesy" than "Jebus" because it's an insult to the Jebusites, who were a real, if primitive, people thousands of years ago.
Just had to throw that in! :-)