Again RETARD you can not provide a single verifiable example of a single Mammal evolving into 2 or more distinctly different species. Without that proof there is no evidence to support the claim that mammals have done so.No, you don't. Evolutionary theory is the explanation for the diversity of species. You don't believe animals speciate. Therefore, no , you do not believe in evolution .I believe in evolution dumb ass.
One more time:
Let's assume we have no definitive proof that any mammal has ever evolved into two, distinct species. (Your only contribution to the discussion)
How would this contradict or undermine evolutionary theory?