Because such things, if the evidence is any guide, took place over a very long period of time. However, if you really were a biology student, you should have learned that the origin of living things has nothing whatever to do with the theory of evolution, which concerns itself exclusively with the way existing living things evolve. No wonder you don't like evolution. If I thought it was about such things, I wouldn't like it either. Evolution requires evidence.
Religion requires faith.
I'd like to explain this in a little more detail. But, as you say, it is the only, current, nonreligious explanation so therefore it must be followed with the blind faith of a Franciscan Monk. Nope, you just made that up. Let me make something clear, Templar. I don't mind you disagreeing with me.