Somehow conservative Christians never seem to apply this logic to Leviticus 18:22.
The new testament does have some not nice things to say about same-sex relationships IIRC, but nothing that condemns it nearly as strongly as the old testament. Just “will not inherit the kingdom of god” or some junk like that (which applies as well to thieves, drunkards, idolators, and adulterers, which I am sure encompasses a number of “good Christians”).
It’s all just silly, honestly. If the whole point is that people will be judged for whatever in the afterlife, then why care what anyone does in this life as long as it doesn’t affect you directly? If gay people don’t want to be “saved”, then leave them the fuck alone. Pretty sure the Bible says that salvation shouldn’t be transactional anyways.
The entire idea that any of this has to do with being “saved” is a Christian invention anyway. The Hebrew Bible uses the exact same wording regarding eating pork. These were clearly a code of behavior that were intended to apply to one particular group of people, and possibly only a subgroup of that group.
Additionally, many scholars consider this passage not a condemnation of homosexual sex, but relating to inappropriate sexual domination. Of course it’s extremely problematic that heterosexual sex would be considered a dominating act, but that’s more than we should really get into right now.