magicofrealm:
would it be a sin for Christians or Catholics to play those? Because technically it's creating a false god or something ^^;
Is it a sin? For some, absolutely. For all becomes the question that is very debated. Those in favor says yes, it's ok. For those not in favor, do not play, and that's not always because they don't enjoy those games.
I would say that to automatically say it's ok, and you enjoy playing, that is a bit of a bias to say it's ok.
My recommendation is for those who feels it's ok, please take the game to your pastor. They are more learned of the bible, and can step back from the biases that may be present in a roleplayer.