That actually sounds plausible, and has been proposed quite often. There are very detailed descriptions concerning how souls are collected after death, debriefed, and then reincarnated for additional rehabilitation. Given the nature of humans, it is difficult to refute.
Here’s another problem, we’ve had flybyes well before Christ, there’s even some Christian artwork including the vessels. Then we have how many characters in the Bible doing space and time travel. Most notably John.
Anyone capable of this is also capable of embryo transfer.