Do you believe the Church owns the calendar? Or perhaps Christendom/Christians more broadly?
Any larger change would be symbolic and completely impractical, with waves of inconvenience rippling through civilization. But many non-Christians use the calendar now. We don’t want to call this the year of our lord because it isn’t our lord.
I see your kind with the “there is no joke” nonsense occassionally, and I never know if you’re wilfully obtuse because you don’t like this humor, or really don’t even understand how it could be funny.
I’ll tell you it’s kinda funny.