Like a heavenly being that comes to Earth, is changed into a new born human and claims to be the person responsible for creation. Is later crucified and resurrects in a completely different life form. This is a problem within sciences.
Earth originated stories between imposters and the genuine article have been discussed in academia and do have an Achilles heel. Contamination from decomposition at the time of death when bacteria and or fungus are present can give misleading results.
DNA and the Starchild Skull: No Alien Hybrids Here - Dr. Michael Heiser
The problem with religious belief as with all belief systems is the lack of uniformity by all those who are involved with it. Add to that a long length of time, the loss of generational knowledge occurs. Much like the claim that Copernicus discovered that the Earth orbits the Sun, there is a Greek astronomer from the 3rd century, Aristarchus of Samos who had the same general idea.
From the little I remember, this question of origins can be traced back to the ancient Greeks.
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Either, therefore, the initial assumptions must be rejected, or there must be only one center and one circumference; and given this latter fact, it follows from the same evidence and by the same compulsion, that the world must be unique. There cannot be several worlds" Aristotle
Exo-Vaticana: Plato, Aristotle, Epicureans and the Apostle Paul