I’m really sorry for the pain this causes your friends. It is clear that you care about them deeply. I think part of the difficulty here is that Christians understand the church slightly differently from how it’s often described culturally or by non-believers.
Biblically, the church isn’t primarily a social club or even just the ‘heart of the community’, though it should always intend to be welcoming and hospitable. The church is the gathered people of God, centred on worship of Jesus, the preaching of the Bible, and the call to repentance and new life (Acts 2:42). Its doors are open to people from every nation, background, and story – absolutely so – but it also asks everyone, without exception, to submit to Christ as Lord. That’s why there are people who remain celibate and single where they believe they cannot submit to God’s design for marriage.
So I can understand why this feels personal and painful when it affects people you love. But from within a biblical framework, the church isn’t trying to exclude people from community or dignity; it’s trying to be faithful to what it believes God has revealed. Christianity holds together two things that are often pulled apart: a clear call to repentance, and a deep commitment to love people as they are. All of us are called to bring our lives under Jesus’ lordship, and all of us fall short and rely on grace.
I appreciate that this may not be the view you or your friends share, and I don’t expect it to be persuasive if you don’t start from the Bible. But it does explain why a church that seeks to teach Scripture faithfully draws the lines where it does, while still aiming to treat every person with respect, compassion, and love. It invites us and welcomes us in, but to turn away from our past behaviour. I’m not sure how one could call Jesus their Lord and Saviour otherwise (which is someone’s personal decision!)