Eve was a chimpanzee and she had sex with a wild pig. That is the "sin" that all humans still carry in their genes.
Humans are hybrid pig chimpanzees
http:// www.macroevolution.net/human-origins.html
Aliens are real and we arer evolved from them. Complex organic molecules formed originally in space, likely in the dirty snowballs that we call comets, which periodically boil in the high radiation environment of the sun and then freeze as they move away. These molecules seeded earth and we are their descendants.
But the more interesting aliens are the ones that do not have physical bodies. Ghosts, spirits, angels and DEMONS. These are summoned and possess a willing human like in voodoo rituals. While in control of a body, the speak to us, write instructions for us. The people who can channel such spirits/aliens are often called prophets, but not all of these aliens are nice. Some are downright evil and deceptive.