Each socierty has its own calendar. As the West ascended, the Christian calendar was used more and more. There was “Anno Domini,” which included the implicit assumperion that Jesus is God.
But there was also a date that Islam uses, a date Chinese New Year is based on, and so forth.
So AD and BC made it clear that, if you were a Moslem or an atheist, you were using this dating for convenience. There was no COMMITMENT to it.
In its desperation to get rid of the name of Christ, Political Correctness destroyed this obvious accomodation. It is now The Common Era, BCE and CE, the dating EVERYBODY must use. This is supposed to make the Moslems and the Chinse, etc., feel better.
Actually it makes them feel no way at all. Nobody but people who get paid for it take PC seriously in such nitpicking situations. But this declaration that AD and BC are the absolute standard for all is a curious way to make others feels empowered.
It is like the total assumptionof white supremacy that everybody takes for granted when they blame white people for everything.