The guy who doesn't like religions (or just wants to play without religions this one game) can do that regardless of whether or not the Grigori can use religions. The guy who likes religions can play with religions as any other civ regardless of whether or not the Grigori can use religions. The guy who wants a buch of heroic Priors running around converting things is out of luck, though, because the Grigori can't use religions. Magic and the Khazad is the same issue, but less pronounced. Ultimately, it comes down to whether the Grigori flavor is worth losing out on some possible strategies. I personally, don't think it is (though sometimes flavor is worth losing out on mechanics) - Cassiel's single-minded, snobbish militancy really annoys me, and I'm no fan of any gods myself. In any case, I'm proposing abolishing the Grigori, and giving their adventurers to another civ. Under those circumstances, I don't think any other civ should have the Agnostic trait. As for the Khazad, the inability to use magic isn't really a fundamental part of their flavor. In fact, I've played a full game with the Khazad, and only realized they couldn't use mages when looking them up to write this thread.