All of your comments are based on the assumption that Mankind has evolved from another species.
Yes, that is assumed in evolutionary theory. All species evolved from prior species.
The idea that man evolved from ancestral apes is also well supported by the fossil and genetic data. That we, like the other apes, evolved from non-primate ancestors is supported by comparative anatomy studies, comparative physiology studies, comparative embryology studies, and comparative biochemistry.
Evolutionary theory predicts the presence of this connectedness - these nested hierarchies. It is a necessary consequence of universal descent from a single ancient ancestral population.
Even though I believe that over time changes can be made within a species I do not see any evidence that proves that one species evolves into another.
Proof isn't necessary. The evidence is robust - so much so that if Darwin's theory were falsified, there would be no alternative hypothesis apart from some type of intelligent design by a devious entity that wanted it to appear to us that we had evolved, but either made a mistake and accidentally put a rabbit in a pre-cambrian layer that we discovered, or was playing an elaborate hoax on us including planting Easter eggs for us to find to blow our minds.
If you find those scenarios plausible, you might also consider vat-in-a-brain scenarios, matrix scenarios, and forms of last Thursdayism. It's pretty much all that we would be left with, none of which is consistent with Christian theology. That is, whether Darwin's theory is falsified or not, Christianity simply isn't consistent with what's been found to date, none of which goes away with falsification of the theory.
Do you take issue with God giving specific commandments in regards to the owning and treatment of slaves in ancient Israel?
Of course. Don't you?