It's funny because you don't realize that what you are saying directly disproves god. ''But we don't have even one factual spontaneous generation.'' So you are saying god did not spontaneously generate the planets, stars, animals, the universe?
is it required that God created the universe by spontaneous generation? We don't know how He created the universe, scientifically. God, being outside the universe, has His own ways of doing things. Just because we recognize many things within the universe as being made by other things in the universe, doesn't mean God did it that way, or spontaneously, when He made the universe. What ever way He did it, we don't know, scientifically.
As an example, at least one religion says that He spoke the universe into being. I don't mean to make this into a religious post. All I am showing is an example of a kind of cause that we don't understand. That's why God is scientifically called, at times, The Great First Cause.
It seems like you don't like the idea of God, whatever He/It happens to be. So you limit your ability to think objectively, just to focus on what you want, rather than what exists. Why are you so against science that you won't accept scientific proof when you are shown it, yet you often accept as scientific proof, some scientific theory, which is known to not be factual? What do you have against science?
