That really doesn't make much sense, dragonfire. I don't know what Feige is trying to pull. The entire point is that the Celestials are the "space gods" and they're the ones who created superhumans in the first place, and those genes got passed down through the generations until they finally began emerging in ordinary humans. Eternals were the creation of the Celestials, and they left Earth for Titan a loooooooong time before mutants showed up.