Okay, that makes me feel better about going with Yahweh option.
IIRC, Yahweh isn't actually considered the "god of the bible" any longer, right? Maybe a prototype "God"? Or am I misremembering something I saw a while back on the History Channel? Forgive my ignorance, I couldn't be any less religious unless I started burning bibles to roast marshmallows on Sunday mornings.
Point is, we're gonna need a name for "God" or people on this planet are gonna get confused whenever it is mentioned in a conversation.
You can just say 'God' in French to avoid confusion, the use of the name was uncommon in the time period Roland is from.