Catholic, Christian, Atheist banned as player names from Diablo III
As discovered by D'Toid, Blizzard has banned a bunch of words revolving around several religions being used in Diablo III. Some of them include Catholic, Atheist and Christian, the latter making it even harder if your first name actually is Christian. The words from religion that are allowed include Buddhism, Protestant and - wait for it - Scientology. Nothing else to add, your honour.
There's more names banned through the link.