Is this a good idea? would we be hunted down for using actual religions in a game?
Religion is a pretty tough topic in certain parts of the world (US, middle east), so it might draw a lot of attention of all kinds there.
Since religious (and others, really) fundamentalists usually act irrational, there's no good way to predict what might happen.
Anyway, I suggest you watch these 2 videos to get a feeling on what's a good approach to the topic from a game design perspective:
http://penny-arcade.com/patv/episode/religion-in-games-part-1
http://penny-arcade.com/patv/episode/religion-in-games-part-2
Kudos for the Extra Credits!

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