I'm just wondering that if that's the case why change AD but not change Wednesday?
Why expect language change to be consistent? Language evolves in unpredictable ways. There's no sense in trying to impose regular rules on it, and no sense dwelling on etymological history. As I've said, what matters is how effective a term is at communicating its intended ideas today and tomorrow. Regardless of the reasons, CE/BCE has increasingly become the preferred terminology. There's no point in arguing whether that's right or wrong, whether the reasons for it are valid or not. Lots of linguistic change happens for nonsensical reasons or because errors come to be accepted as standard usage. So the whys and wherefores are beside the point. What matters is what people actually use.
Maybe I'm an angry Christian that feels like my religion's being "erased."
Maybe I'm genuinely curious and interested about what causes one change and not another.
Maybe I'm just a Star Trek fan that likes to make everything tie together.
There's always an explanation, even if it's an irregular or illogical one. I'm not demanding people switch back even if I think it's silly, I want to know why this change and not another. It seems silly to say "it's because I don't believe in x and so won't use its reference" when you almost certainly don't believe in "y" but still use "y."
Kudos, and ITA!
