I’d like to think @SavoirFaire is right. Certainly if aliens arrived here and claimed that Jesus, or Mohammed or Buddha had been revealed to them too, that would weigh heavily on human belief. If, on the other hand, they arrived saying that in their distant past, they had a creation myth rather similar to one of our many creation myths, but that they long since gave it up, realizing that it was the effort of primitive minds to grapple with and explain things that, at that stage in development, were mysterious to them; then I’d hope humans would catch on that the same is probably true for our 4,000 year old creation myths.
Sadly, I don’t think I can count on very many of my fellow humans being that logical.