I'll take the advice both here and at cf.net and not have Christianity and Islam - my plan for Christianity was to make it spread into Egypt and make them in uber-religious nation constantly bickering with everyone, and for Islam was to have it spread into Axum, and have it spread all though East Africa.
I had one planned Alternate western religion emerging ITTL, and my plan was for it to be made by some Macedonian philosopher, who'll combine a lot of other ideas by previous philosophers - mainly a mix of Plato, Aristotle, and Stoicism - that ends up being like a China-like situation, if you know what I mean. There might be others - say spinoffs of Zoroastrianism and other philosophical ideas - perhaps like a mercantile religious/philosophical thing emerging in Carthage, or maybe a different spinoff of Judaism emerging.
Anyways, thanks for the comments, although this thread won't be used for my TL anymore. I should have it completely edited, rewritten, more detailed, and have a VERY long update on a Third Punic War in what I call Carthago Invicta v. 1.25 by Saturday or so.