Religious Warfare

Okay, this is another alternate reality sort of thing, based on another weird dream.

Imagine a world where there are four major religions.  Paganism and Christianity were two that were featured in the dream, so a writer would have to come up with the other two.

Now the Pagans didn't have heavy duty military hardware, whereas Christians didn't mind blowing things up with tanks, bombs, etc.  And they were after the Pagans in the dream.

So what are the other two religious factions and how do they fit into the warfare dynamic?  Are they allied with the Christians, the Pagans, each other?  Or are they at war with some other faction?  Describe the different factions more in detail.

I know the Christians were more than happy to rape, pillage, and plunder.