All religion is made up mumbo jumbo in order to keep folk in line.
I asked my folks over 20 years ago why is Jesus’s death on a different day every year yet my grandmother (RIP) was on the same day every year they couldn’t answer it so that was my catalyst to being a non believer in religion.
As regards other people’s faiths, that their business and I will honour their believes as long as they honour mine. Simplez.
As regards, modern da christening, communions, confirmations and getting married in a church, it’s mostly to do with tradition, respect for the grandparents, and to get a child into schoool(although this has now been banned)