The questions I have posed are philosophical and theological questions. They concern the nature of consciousness and individual uniqueness. They are not scientific, but they are pertinent to the subject of time travel.

Flight was always familiar to humans in the form of birds and insects. Is it a coincidence that angel wings resemble bird wings?

One of my favorite science fiction stories involving time travel is "The End of Eternity" by Isaac Asimov.

https://en.wikipedia.org/wiki/The_End_of_Eternity

It is centered around a time travel system operated by an exclusive bureaucracy. Its mission is to prevent catastrophic events throughout history.