I like you, you're willing to actually discuss things.
I may be HomoRyoshu, but that's just for shits and giggles. IRL I'm a bisexual man, in a heterosexual relationship. She's always had a strained relationship with the church (Catholic school almost killed her), and part of it is she likes the idea of heaven and the afterlife.
We've discussed the difference in our beliefs and we have come to an agreement. I don't have to convert, and I don't interfere with her practice, and attend church with her occasionally. We went out of our way to get a wedding approved by her church so she didn't have to receive penance.
As for circumcision, yes it's a primarily a Jewish practice, however it's still exceedingly common in Western civilization, regardless of faith. I don't agree with the practice personally, I think it's a needless procedure primarily performed on newborns.
Finally, yes you can leave religion, but you can also leave "LGBT" if you want to view it as one. People do detransition, or separate from the LGBT community. Sure in some cases there's permanent "damage" to both the body and/or reputation (cancel culture is a joke), but the same could be said of certain religions (it is not safe to leave Islam in Muslim countries from what I hear.)
I did mention "you do need to know how to navigate yourself in the arab side".
I know about islam, half of my country are islamic and it's a general rule to not talk about it to them except you want to risk your life, because they have a greater tendency to kill you for speaking against and have killed people for speaking about Muhammad for instance.
There's a reason so many terrorist groups are islamic.
Christians in comparison will just say somthing about Jesus, Hell or whatever and eventually just get tired.
(The Traditional religions where I am, don't really care, since they got used to the results of hundreds of years of colonisation and a bunch of thier Gods are in British museums. )
But it is still easier to leave religions now than any other period in history, and especially in the west.
As for your partner, kinda peculier she didn't leave to one of the other denominations, christianity has about 30,000 denominations in total and the protestent ones (as long as it's not charismatic speaking in tongues ones) tend to be less mentally straining as it's mostly just believe Jesus and don't sin, on that side , going to church isn't even mandatory as the sabbath is OT traditional law and stuff.
Seems she's very "human" having the constant fear of death keeping her beholden to her faith.
Btw I know circumcision is very prevelent in western culture, it's very prevelent literally everywhere and while it sucks, it is a bit reversable though as I said.
I was circumcised and I read on what to do to reverse it, I'm just not in the mood to be that constant about it.
Maybe later in life I'll bother with it.
In comparison You can't reverse cutting off body parts or the numerous amout of problems steroids/hormones and castration drugs do to you.
Like if you get Heptacellular Carcinoma from TRT what exactly are you doing with yourself, hoping that they can cut the tumour out before it spreads.
Only people that can really detransition in earnest are the ones who were just wearing dresses, mimicking voices, wearing wigs, everyone else is permanently fucked.
Your Biology is you, you mess that up and you deal with it till you die, so leaving religion is not the same as my Biology being messed up, being medically dependent trying to manage a weakened body system in a shortened life span.