General Relativity.
What have you got?
He has faith. You can not argue with faith. It has a blank check on reality.
A huge gap in my knowledge, since I've only been around for about half a century.
And you've got a theory.
Do you assume that the speed of light has always been constant back into infinity?
If so, how do you prove infinity?
If not, didn’t light have to get “up to speed,” and/or “down to its current speed,” at some time?
These are just simple questions that occur to me.