I haven't heard much evidence to imply that aliens created humans or mankind. It seems more likely that humans developed on thier own (although I wouldn't completely rule out the possibility of panspermia). Even if I were to accept that aliens visited the ancient Mayans and Egyptians, that is a long way from being evidence that they created humans.
On religion, I would say its very unlikely religion came from anything but humans. After all, what better way to make people police themselves? Additionally, religion is constantly changing. Polytheism used to be more popular and now monotheism has become the norm. Even under those big headings there are a huge number of varieties and branches of each religion.
None of this proves nor disproves the existence of God in any way.