They don't have to be any more intelligent than us earth folks. They just have to be more knowledgeable. Suppose their civilization didn't go through a Dark Ages. That would place them about 1200 years ahead of us in science and technology. We have been at this for merely 200 years.
1200 years? Check out the bible. Let’s look at Mary
Another documented case of alien abduction and let alone embryo transplant; all bundled in an immaculate conception.
With that we can talk about the hovering beacon that sat directly above Christ’s birthplace for weeks. Now let’s add on the resurrection.
But then again, we can talk about space and time travel by the abductees who contributed to Revelations.
We can also bring in all the messengers who spoke of the coming of the messiah.
I think your 1200 years is well off the mark.