Well, I think you learned the lesson pretty well, my friend. Makes me even more glad I did that. As a general rule I get annoyed with people dissing gods, for whatever reason (or even people who severely outrank them...level 5 warrior talking ##### to the hero in the guild? Bah!). However, there are ways to do it where it adds to the roleplay (albiet never a painless thing to roleplay) which is pretty much what you did with Mirdulad.

As for what level of cursing is appropriate, for decent roleplayers, I'd say go with your gut. If it doesn't feel right, don't do it. For the handful of people out there who may not have the ability to discriminate. Stick to what you'd hear in a sort of PG-13esque fantasy movie.