[hurlyburly]

Would it be ok for them to believe in astrology?

It looks like you would create a super-trainable chimp, but you'd need to do a lot more than merely language training (if you could breed chimps that want to learn to play pinochle, that would be something). Even if you manage to increase the language center of the brain, there would still be an awful lot of distance between chimps and humans. More like breeding a pig to have a trunk and large ears. I don't see how it would threaten religion.

The scariest thing about this is what new fetishes would be unleashed ("Live XXX CHIMP-CHAT").