no, we won't made those in depth trait for first relase..... but maybe we could made generic ethnic traits for all native factions... I'm affraid too many interlinked traits will affect loading times and stability (proneness to CTD)

As for religion, we only have 3 in BI. and only those 3 could cause unrest....
Pagan = renamed to "Hindu-Buddha"
Zoroastrian = renamed to "Islam"
Christian

and we did have floating religion swapping system.. means you could change your FM religion via trigger (such as building churches, mosques, or stay for quite a long time in provinces with temples), except for the Europeans (they have higher treshold).

Sonic allready set the plan and that was tested, and those interlinked traits allready take a lot of in EDCT