Just so you know, "BC" and "AD" are still extremely popular in vulgarization and popular culture, but most scientists switched to "CE" and "BCE" by now. ("common era" and "before common era"). It's more neutral (which is important when you work with scientists who are not christian but care about religion, for example), and also less confusing when you're talking about topics such as the real date of the birth of Jesus Christ, for instance.
For a similar reason I don't really care whether the date is AUC or BCE, but I find it really, really weird to have it "before Christ" because you're literally playing with the circumstances that could make someone like Jesus Christ appear or not. I know there's an increasing number of bigots and "traditionalists" in our societies who think that writing "BC" or "AD" is part of their identity, but it feels unimmersive to me.
Out of interest, what happened in year 1 CE that makes it the Common Era? What great event was it that united such far flung places as Korea, Ethiopia, and Norway in a shared era of mutual importance and dignity or whatever "Common Era" is meant to mean? Was there such an event? Is it still refering to
that other event, just in euphamistic terms? Or is it not refering to anything at all - just sounding nice but meaning nothing?
A second question, if you'll indulge me. If the goal is to secularize the calendar to make it neutral, why is it necessary to stop using BC/AD, but perfectly fine to keep using "March", "July", and "Wednesday"? Why is it neutral for the calendar to refer to some deities, but not to others? Invoking the divinity of those entities is certainly equally offensive to certain groups around the world. Julius Caesar was a mass-murdering warlord, and we still set aside one month a year for his deification. If it is truly a secular "common era", why does one tradition and only one need to be ripped out of our dating conventions?
Personally, I still use BC/AD, and will continue to do so. Not because I'm making some absolute religious claim every time I write a date, and cetainly not because I'm a scary bigot out to oppress people through the way I use to refer to events that happened before I was born. BC/AD is what we inherited, it's what I learned, it refers to a specific event (which may not be accurately dated, which perhaps may not have happened at all, but I still know what it is and what it's supposed to mean), and I've heard no convincing argument to change it other than "we (academia) will punish you if you don't".
I understand that there's for room for respectful disagreement in these matters. I personally think it would be best to leave words like bigot out of the conversation.