I Wonder

If math is a product of science, and ALL religions preach about having faith, why is it every religious act is time/date based ? Isn't the time/date just a depiction of where the earth is at a specific point during the day ? Why is it we have mass at 0630 a.m. or Christmas on 25th December.

Or is it the other way around? Where time just a representation of a religious act which we're meant to honour, but unfortunately most of us don't?