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I don't think the Christian influence makes that much difference compared to other countries in east Asia. I think that for whatever reason the Koreas just tend to be more "extreme" in whatever ideologies or endeavors they adopt including homosexuality. I do think that east Asia in general tends to lack the same kind of puritanical outrage culture you see in the west, specifically America, towards media so they are less likely to care about gay characters or other mild sexual content in media.

I think in general the basic "traditional" east Asian attitudes towards this sort of thing is that cross dressing and being gay are basically seen as the same thing, and it's viewed as a kind of childish phase that people are expected to grow out of and do their familial duty later in life by having a spouse and kids, rather than a grave mortal sin which condems you to hellfire.

So outside the communist countries where sexuality of any sort that doesn't accomplish the states goals is suppressed (meaning we need more workers so have more babies, as homosexuality is less tolerated in China recently as they face demographic consequences of their one child policy), I think that most westerners will find east Asian attitudes on these to be more, shall we say tolerant, than is expected from the more right wing elements of western societies, but lacking much of the overtly pro acceptance elements we've seen in the west recently.

They do tend to adopt the American corporate DEI type trappings from time to time but these lack any real connection to the grassroots LGBTQ movements that do exist in Asia at the moment so are basically viewed as foreign influence by most, or are simply accepted by "NPC" not so much different than the west. About where they were in the 90's or early 2000's imho.

The only country in East Asia that legalized gay marriage was Taiwan and I think that is done more to differentiate themselves from the mainland approach towards it which is currently to suppressed LGBTQ and encourage young people to procreate.

Gay or trans characters in media have been around for ages in Asia and really aren't significant in any way towards the larger political movement. The free speech parts lacking the same sort of western resistance towards such that once existed, and the general trend of artsy types being more likely to be gay I think resulted in gay and trans characters being much more common in east Asian media than the west.

Which is partly why I think the online trans movement is so anime adjacent.