After the roman empire converted to christianity, a lot of the roman customs were christianized, but also the roman church adopted a lot of customs from the roman empire, with that I mind I came here with a idea
What if instead adopting the anno domini callendary, the catholic church kept the Urbe Condita one, in this case we would be in the year 2770 ab, or MMXVII if you prefer. Would this be plausible?