Of course, Christians themselves apparently come up with the idea that religions have expiration dates - their contrived BC/AD division in history. Has Christianity therefore entered its own late, BC-like era?
I don't understand what you mean. 1 AD is the beginning of a religion, not the end of any other religion. BC, 'Before Christ', doesn't refer to any non-Christian religion expiring, does it?
He likely had something like the Old Covenant/New Covenant distinction in mind. Out with Judaism, in with Christianity.
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