Evolution is a pretty good study and fascinating read. All life on earth's DNA has been from the same source and the same origin. Not several, just one. Why not more than one alien species? Maybe they'd use a different type of DNA sequencing with other chemical roots (silicon maybe?) Why not more than one God? I mean if a God could imagineer entire things out of thin air, why would they imaginamate the same building blocks of life? God(s) is typically vain and jealous. He'd have His watermarks all over the place. One source. Is it possible for a simple cell to evolve into a fatty multilayered one like we have? The examples are all over the earth. It's pretty big planet. This little component in your own cell, mitochondria, could've been it's own living organism billions of years ago. There are a lot more answers than there are evolutionary questions for the steadfast Believers. It's just that the remaining questions have been boiled down from a playbook. You're right, evolution can not explain the Origin Theory. It doesn't have to. That shouldn't be jumping grounds for God or Aliens though.
