Ok how about this? All religious techs are dead end techs.
*phew*
Included are some new non religion specific techs (Animism, Karma, Reincarnation and Resurrection).
Tell me what you guys think? I think this works nicely. Especially with the supplementing techs.
EDIT: Note that all religion techs should have the same buttons as their religious icons, but the the other techs will need a new buttons (except for Animism which can use the Shamanism tech button).
Also I can chnage the name of the "Shaman's Hut" to "Sage's Hut" to unlink it to Shamanism.