I have created a mod which adds all of the "Classical" Religions, as they are listed
here. This includes all 7 origional Religions, and also Shinto, Sikhism, Jainism, Zoroastrianism, and the Baha'i Faith, a total of 12 religions
.
I made Sikhism, Jainism, and Bahai Faith from scratch, and borrowed the artwork for Zoroastrianism from TAM (though i changed it a bit), and I borrowed all the shinto files from Dual's Shinto Mod.
I havn't done a whole lot of testing, but the new 5 religions seem to work just as well as the origional 7. The only bug i've found so far is the names of the religions overlap on the religion screen, and i don't know how to fix that.
Download:
http://www.civfanatics.net/uploads12/Classical_Religions.zip