I really don't understand how people who are reasonably devout followers of different religions ever end up together. Almost all of them make it against the rules or at least extremely problematic. Why would you marry someone that your religion says is going to hell because they don't believe what you do? And if you do it anyway, why would you stay in that religion? Makes no sense.
People are allowed to break the rules of their own religion at their convenience but other people must always abide by those rules. “It’s ok when I do it”, so to speak.
there is certainly too much of this these days. I can only speak for myself but I try to live my interaction with others in a more libertarian manner, while trying to hold high moral standards for myself, but I fail regularly. I particularly struggle with attempting to balance what I believe my religion teaches regarding raising my family with the faith, while still respecting their rights and autonomy as individuals.
If by "the biggest group in her religion" you are referring to the Catholic Church, that's not true. While it certainly would be a mortal sin, really all of Protestantism is heretical, but the Chruch does not condemn any individual to hell. In fact, as St. John Paul the Great tells us "We know that hell exists because Jesus told us it does, but we don't know for sure if anyone is there" If she was unrepentant prior to her death, she would likely spend some time in purgatory, but I suspect less time than I will spend in purgatory, as I should know better to avoid serious sin than she does based on her raisin'.
When I was a somewhat devout JW (people often say Jehovah Witness as a noun, but that always bugged me grammatically since properly stated it should be "Witness of Jehovah), I told a nonJW Christian friend that I couldn't be "unevenly yoked with unbelievers." She (who wasn't interested in me, she was trying to matchmake me with a mutual friend) got offended since we should all have been Christians and she felt I was calling her an unbeliever.
Certain denominations have so very different beliefs that if followed to their logical conclusions they shouldn't be able to have relationships, but so many people bend the rules. I fortunately am no longer captive to that ideology, though I do think I'm permanently damaged. Still, not as damaged as people who went through sexual abuse. My stuff is mostly mental and will probably just mean I'll never have a romantic relationship.