Monk if it were offerred, but I voted Mage.
I have no knowledge or experience with arcane magic/witchcraft, but I feel like I've got a good grasp on D&D thaumaturgy. More than that, though, I'm an academic. If I was going to study magic, I'd have to concentrate on true name research, magical grammars, and power word magics. I could get a job at a wizard's college teaching remedial verbal spell component pronunciation.
I, too, am an anti-fan of organized religion, but oddly enough, I tend to be fairly religious. I could go cleric if I had to.
Not too great in most weapons forms, but I suppose that I can hold my own. Laziness lowers a person's Con, though, so fighter wouldn't work.
Thief is just such a vulgar word with such negative connotations. That, and I'm a bit clumsy sometimes.