Why do you think we deny that Earth was inhabited by space aliens?

We humans love to debunk each others' religious beliefs, because in doing so it makes us feel that our intellect is superior. Here are some examples of how people try to make themselves feel like they are smarter than "religious nuts."

"What? You really think a man was born of a virgin and then walked on water? Ok dumbass."

"What? You really believe there were gods that flew around in the sky and fired thunderbolts. Have you ever heard of science, you freaking idiot?"

But for skeptics like this, my question is. Aren't you the one in denial? Every ancient civilization has so-called "myths" about gods and goddesses intervening in human life.

Are all of your ancestors simply crazy? Imagining things? Documenting imaginary events because they had nothing better to do? Building temples for the "gods" that look like landing pads for flying sauces, oh yeah, because they were just idiots.

Could we not just stop all this pointless bickering if you would just face the facts, that the earth was inhabited by aliens from outer space? Now, imagine you are the alien whose job it is to seed the Earth with life. What are you going to tell your experiments? "I'm your creator," that's what you're going to tell them.
Why do you think we deny that Earth was inhabited by space aliens?
Why do you think we deny that Earth was inhabited by space aliens?
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