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.
The Bible stories may or may not have been ET related. Those issues are completely beside the point.