I was thinking, the US follows the Mayan calendar. We, as a country, claim to be in a practice-your-own-religion zone with no real consequences other than from the people around you. Day 0 (year 0?) was something about the birth or death of Christ or something. Why is it we follow that? I'm Jewish but I'm basing this off of factors such as when dates started to be recorded by humanity. Based on a quick Google search, that's 5773 or 5774. Why do we follow year 0 being based off of a specific religion? Just because? I don't know too much about the religion so please elaborate if I'm wrong.