Comparative anatomy

Mainstream creationist theory is that there is a supreme being who created the universe and all it contains. There are at least three different beliefs on how this happened. The first is that God created every living thing in the universe. The second is that God set up the rules in the universe, created the first living cell on earth and then left life to evolve on its own. Another theory is that God created the different species so that there was no evolution between species but natural selection created a lot of adaptions resulting in the wide variety of organisms we have today.
There are a lot of similarities between species. Mammals, for example, include bats, dogs, and humans. The bones in the arms, hands, and fingers of humans are similar in structure to the bones in the wings of bats and the front legs of dogs. If God created all living things, why would He create so much similarity between species? If He is creative enough to create the incredible variety of substances, molecules, living things, planets, etc. in the universe, why would He make the anatomy of so many living things similar? It doesn't seem logical to me. The first theory seems the least likely to me. The second theory seems more probable but I see so many holes in the idea of evolution from one species to another, that it doesn't sit right with me either. The third, again, seems more probable but we come back to the question of why an incredibly creative God used similar structures in many different organisms and put them together in a way that is inefficient in many instances. This leaves me with no theories that satisfy me and a whole bunch of questions.