I have had my fair share of such conversations too.
In reference to Jesus Christ, the strongest argument I can come up with in favor of him being a real person/event is that SOMETHING so extraordinary had to have happened at the time period between 1 B.C. and 1 A.D. such that calendars were forcibly reset to ZERO to commemorate that person/event. What other person or event in all of known history had that same effect on humanity?
Something very notable to the extreme certainly happened at that time.
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