I like most of these. Scientology is largely considered a corporation, and not a religion---I would suggest striking it from the list, or including it as a corporation, after altering the name some.
There are quite a few heretical versions of christianity, arianism being just one.
Stoicism
Atheism
Candomblé
Pastafarianism(for a joke)
Secular Humanism
Scientology
Deism
Arian
(some other Jewish denomination)
Try to stick to reality, not to the personal views of the posters (including me) here.
If u add Mormons, u can add Jehova's Witnesses and Tele-evangelism too.

Another one to add to the Corporations lists.
It's in my stomach! (eating pasta as I type)
Here are some the philosophies I am thinking. I am posting this here to get input. This is some brainstorming ideas.
I think you need to go over some of the 'philosophies' carefully. For instance I'd classify Ghost Dance as a kind of religious revivalism of the native shaman traditions. Perhaps it was a synthetic one (merging older traditional tribal religions into one)? Is it a really a philosophy in the classical sense---bunch of wise man sitting around trading ideas and generating a school of thought?
But then again some early philosophies become embroiled in mysticism and become semi-religious, like platonism and Pythagoras,
http://en.wikipedia.org/wiki/Pythagoreanism
I'd also vote for expanding the sects of Judaism, since historically there were several. Significant religious ones from time of Josephus: Pharisees, Sadducees, Essenes, and early Christians (prior to it diverging and forming holy cities away from Jerusalem).
I'd also vote for making this mod as comprehensive as possible, AND plug and play. So just throw all the ideas in, branched under logical blocks (perhaps even redundantly moduled), and let the modder plug in X (x=7?) or so modules at a time. So if I want a SE Asian mod, I can plug in all the Buddhist ideologies I want, whereas if I want a European Wars of Religion, or a 21th C. North American post-apocalypse mod, I can plug in blocks of religions relevant.