Is Christianity changing its views on homosexuality?
The Catholic Church used to be totally anti-gay and even burned gays at the stake, but they now admit that people are born that way, and should be treated with dignity and respect. However, all gays must remain celibate their entire lives.
Protestants for the most part didn't really care much, and it was not a central part of their doctrine until the last half of the 20th century. With more and more gays coming out and demanding their rights, many of these protestant christian branches became 100% anti-gay. So there was a move towards more antipathy.
For instance, 1 Corinthians 6:9 used to say in the KJV: Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind...
The Christian Standard Bible says: Do not be deceived: No sexually immoral people, idolaters, adulterers, or males who have sex with males.
The Comporary English Version says: Don't fool yourselves! No one who is immoral or worships idols or is unfaithful in marriage or is a pervert or behaves like a homosexual.
As you can see, in the 20th century there have been attempts to rewrite the Bible to make it appear more anti-gay than the original KJV states. There are many other rewrites, but they are all along the same lines. So if anything, modern Christianity has become far more anti-gay than previously. One could ask why they feel the need to rewrite the so-called Word of God, but they don't like those sorts of questions.
Basically, the more conservative the church the more it has hardened its stance on gays.
The same thing, btw, happened with abortion. Abortion was never mentioned in the Bible, and was never a religious issue until the 19th century. Even then, it wasn't really a central part of these various Christian denominations until the 1980s when they formed an alliance with the Republican Party and Ronald Reagan.
For many of these churches, anti-gay and anti-abortion pretty much defines the only real issues for them.
On the other hand, many of these same churches have shifted their stances on poor, the rich, and the ill, and so on. Many of these churches fully support Donald Trump as president, even though he is rich, an adulterer and has married three times, all things Jesus specifically said we should be against. Jesus led by example, of course, and he healed the sick, gave to the poor and treated strangers with welcomes. But these churches now give sermons the health care for the poor should be removed, the poor are poor because they are lazy and so don't deserve much in the way of aid, and support Trump's most vile policies towards immigrants.
If a Christian church can do an about face on the basic tenets of their faith, one would think that they could do the same with regards to gays. However, as we see with the likes of James Dobson, Tony Perkins, Randall Terry, Pat Robertson, the late Phyllis Schlafly (who has a gay son but didn't like that fact noticed), and so on, I think they will continue in their alignment with the most conservative politics in the US rather than any actual traditional Christian beliefs.
In recent years, there has been a significant decline in evangelical and fundamantalist churches, especially among the millennial generation. A bit part of the reason is that sermons against abortion and homosexuality have become relentless, and young people are pretty much fed up with it. They have gay friends and know that we are not spawn of SAtan. (Recently, I sparred with a woman here on Quora who insisted that I and all other gays are possessed by demons, and because we don't get rid of the demons but instead enjoy the possession, we are all going directly to hell and deserve all the misery on earth that get.)
The Mormons have made a small change, however. Their Prophet claims to speak directly with God, and several years ago, he said that the church would no longer baptize children of gay parents. The church also funded Proposition 8 in California, which reversed same sex marriage rights in that state. Due to a huge outcry from their own members, the church decided to not get involved at all in subsequent marriage right battles in various states, and also God told the Prophet to change the stance on baptism. Now, children of gay parents may get baptized.
And it's all about the money! Mel White was the speech writer for all the televangelists of the 1980s and so was privy to their most private meetings. In his autobiography, Stranger at the Gate: To Be Gay And Christian In America,he details exactly how, when and why the religious right came to make anti-gay policy a central part of their faith. When pews empty out, these churches will either have to fold up or soften their stance on gays.