Or fourth: the moon was created in a total natural way consistent with know physics.
Also to you explanations:
First: Yeah goddidit is never a great argument especially since there is no god (at least as far as we can tell)
Second: So again alien could have done a lot of things but why would they do that instead of, you know, create a home for their own species instead of creating a new species who could become an enemy.
Third: Ok this is the most stupid. If humans can only come into existence when the moon is there (actually not untrue since the existence of humans is quite unlikely under any different circumstances) than how did humans come into existence and then decided that the best way to make it better for us would not be to give us a teaching about morality and technology but instead a moon which could hamper the whole plan in the first place