mr e

Interesting topic.
This is the first thing that caught my attention. I like that you chose to differentiate between evolution and speciation. While I have not heard this counter argument in person, I too like to believe that "serious" theists would pretty much accept evolution and debate the evidence for speciation in a logical manner.

Regarding the divergence of homo sapiens, that would be a crazy, crazy world. It's entertaining to imagine and the possibility can't be completely ruled out. However, it's probably more likely that we would kill ourselves, run out of resources, or even be destroyed by a natural disaster before something like that happened based on time requirements alone.

More importantly, the creation of a new species is not spontaneous and would require more than a simple isolation of communities. A driving force of selection for the alteration of gene frequencies would be needed just to begin the process. That means certain traits in each group would need to cause an increase or decrease in the ability to produce children.

Maybe if we started killing each other based on our beliefs, we could get this process started. Wait, we would also need to prevent any blending of groups. Haha, it would actually be detrimental to kill opposers from the opposite group as that would only decrease the differences between the two groups.

Ok, so we have to divide into two isolated groups and then each group would continually "purify" itself of the other side's beliefs and then hope that these beliefs have a genetic basis or are correlated with one. Then, cross your fingers and hope that this evolution would eventually lead to differing species. There.