Ah but what if God used evolution (just micro-evolution) to create? Or what if God started creation ex nihilo (out of nothing) and it started with what scientists refer to as a big bang?Yes it CAN be proven that God exists using only logic and reason. First of all, look at everything that exists in the world today, as far as living creatures and plants. Is it truly logical to think that we "evolved"? If we did, then it is only logical that there would still be creatures still in the middle of evolution. Since there aren't, this way of thinking is illogical. Others believe in the "big bang" theory. If this were true, then the entire universe came into existance from a "big bang". Applyig logic and reason, this is impossible because something would have been created from nothing. Look at how wonderfully everything was created, and how everything "works" together, from all aspects. From the sun being in just the right distance, to how animals interact with one another, all LOGICAL conclusions are that we were created.
To create 'out of nothing' is much different to creating 'from nothing'. Something cannot exist from nothing. What is nothing? Nothing is exactly that, nothing. Therefore nothing is nothing and therefore can do nothing. To say nothing can cause or produce is to treat a non thing as if it were a thing, but that is absurd. Since nothing is nothing it has no power by which to exert upon another to cause it, because it lacks existence which is necessary to have in order to do something. So nothing cannot cause something. Only something can cause something to exist.
Variation of species is by definition a process of evolution. This is what micro-evolution is. Macro-evolution however is the changing or development of one species to another different species, of which there is no evidence for whatsoever. You are quite correct though, if macro-evolution were true there would still be creatures evolving from one species to another, being testable and repeatable in the science lab.