As a firm BCE/CE user, sometimes I run into folks who think I might be opposed to it because I don't like Christianity.
No, nothing like that. As a Catholic, I dislike BC/AD not because it's associated with Christianity, but because it's a confused blend of English (BC) and Latin (AD), and that's just sloppy. Also it seems to cause confusion among Christians who sincerely think they're "Before Christ" and "After Death (of the aforementioned)."
No, Jesus Christ wasn't crucified until like thirty years and change after he was born. He didn't just have one spectacularly eventful day where he was born, performed a bunch of miracles, and then was crucified. They didn't even happen in the same part of the year.
Similarly, the calendar used by the different Christian churches didn't just have a leap period of a few decades to skip the evidently unimportant period where Jesus was alive and gathering his apostles. Like, come on, think about it for a second.
