Grow up.
31% of the world is “Christian”
You don’t get to decide how time is calculated for the rest of us based upon your beliefs about a Jewish Prophet.
Grow up? Studying history isn't for grown ups?
Been toppling statues the last few years with your Black Lives MatterTM buddies?
You're welcome to believe He was just a prophet, and only for the Jews, while getting angry that the history of the world is referred to by BC and AD, but then don't get angry when people decide to change the meaning of words, such was when they tell you women can have penises.
...or when gain-of-function experiments are "vaccines".