"You can insist on "Common" if you like, but I will stick to "Christian." I prefer not to accept the pagans' usage."
It's not pagan, and it's not Christian. It's just a way to measure time. I'm a Christian, but I'm not an Anglican, so I see no reason to use their system, either, which the BC/AD system is, effectively. Like I said, Ussher's been dead a long time, and he made some really lousy assumptions in his calculations.
I won't insist you use it correctly, though, as that's your choice.
I don't "use" BCE but I read it with the proper reference. The time division is, just coincidentally, related to the birth of Christ. It is a Christian notation, however you want to call it. I shan't change my usage for political correctness. Now if some different time divisìon were to be decreed, say, the Reign of Hammurabi then I should have to read the notation BH as Before Hammurabi.