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If we believe that humans evolved and that this evolution was heavily influenced by intelligence, that is if the smartest were able to better master their environment and breed.

Now you are asking if chimps have a intelligence that can be increased significantly through selective breeding.

My question to you and my answer is what would lead you to believe that if this was possible, it would not have already occured in nature?

I think that a species probably has a intelligence cap that no amount of selective breeding can get passed.

If it did happen, it would have very little affect on those who prescribe to religion.