I don't have a religion that replaces Christianity in terms of observances and decorations, etc, but I fought long and hard in school to not be made to sing Christian songs, be included in prayer sessions, etc. In Jamaica, you're fucked. The only competing demographic is Rastafarianism, and the class baggage there is...yeah. There was no neutral zone--I got in trouble for answering a question with evolution when the desired response was creationism--uh, it's SCIENCE class. Let's just pretend?
In the UK, at least at my school, it was better. The Moslem and Jainist. girls were quite "why do you have to make a fuss?" but I didn't want to be defaulted into things that people were supposed to mean. There was also no zero option, but they did let me go to Jewish assembly (assembly was religious on Tuesdays, only...) once a week, and since it was a choice, and no one minded me being there to learn instead of worship, things were cool.
The Christmas of Upper Fifth they tried to make me attend the Christmas services at an actual church and I kicked and spat and complained, and again the Moslem and Jainists were all "Shhhh." But I was fifteen and the bee was in my bonnet, and Mrs Shaw eventually obtained permission for me to go to the loosely Chanukah gathering instead, saying wryly "I'm not Christian either, but they won't let me not go to church." I was always very grateful for that.
Fuckit, though, in the end I spent a few months living in a convent hostel with the most ignorant nuns in the hemisphere, and they actually put their hands on me to get me into a prayer session before A Levels. Left my chemistry textbook on the floor of the common room, but since they'd already gone through my belongings and quizzed me about worshipping the devil, this was church I didn't know how to avoid.
Anyway--long way around... "bothered by otherness" and "coopted into observations you don't believe in" aren't the same thing at all. And the pattern of being co opted by the dominant race/religion/sexual orientation is very different from us living in a house with a mezzuzah, especially when you have a belief, a god, a set of rituals that go in that place people keep casually filling with the statistical "winner".
To properly leap into a hornet's nest, it strikes me as similar to "So black people can't be racist against white people???" which is rarely a response to a 180° version of the situation, because you can't escape history and entrenched power in society in that evaluation. While it is equally awful for black people to be prejudiced against white people as vice versa, the landscapes aren't mirror images, and the fifty fifth time you've had to say "That's not my god, that's yours" this month isn't like that time you got mistaken for gay when you were out clubbing.
I don't know how to explain the exhaustion and general psychological ache of trying not to be overwhelmed by other people's default assumptions of what and how you are when you just want to be you, but most other people are white/straight/sexual/cis/American/Christian/dominant and the disregard for your individuality is like an undertow that's pulling you out further and further from shore.
And I have no idea if the thought that was in my head as I was reading is now in the posting box, or if it's relevant, but I'm going to go with the submit button anyway.