[shubi]

Why would a common designer (God) who is so knowledgeable leave out the ability to synthesize vitamin C in both chimps and humans?

Btw, the above is called scientific evidence for common descent. So when you said there is no evidence for humans splitting from apes, you were wrong. Maybe you should check some of the scientific references before you make empty claims.

[DannyTN]

Why would a common designer (God) who is so knowledgeable leave out the ability to synthesize vitamin C in both chimps and humans?

It could be due to the fallen state. That ability to synthesize vitamin C may have been lost. There is evidence that animals are degrading due to negative mutations as well. It's possible the same negative mutation occurred in Chimps as well as Humans. Guinea Pigs have also lost that ability.

God could have other reasons as well, but I don't know what those might be.

Under evolutionary theory, you would thing that the ability to synthesize vitamin C would have been selected over not being able to. But that's not what we see. We see the loss of functionality.