Our local united church is a supporter of trans rights too. I'm not religious at all but appreciate how they actually behave in a Christ-like fashion.
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There are three denomation that officially support the LBGT+ community, that I know of off the top of my head. The Episcopal Church, the ELCA, and the Unity Church. There may be more but those are the ones I know have official and sustained support for the LBGT+ community.
UCC is probably the most progressive American denomination. The UCC church i went to as a kid in Ft. Wayne did a baptism for a lesbian couple's baby back in 2007. The one i went to in Houston 10 years ago had a black lesbian pastor in a congregation that consisted of 1/3 philippinos, 1/3 Nigerians, and 1/3 old Blue Dog Democrats. I would describe myself as an atheist/agnostic, but i enjoy going to the UCC services at the church down the street a few times a month. The sermons have ALWAYS been about how Jesus told people to love one other, and i have never heard a fire and brimstone message in all my years of going to UCC churchs.
i am a church musician and play a few churches each month (usually ELCA and UMC). the local United Methodist i play at is affirming as well. can't remember if the larger church is, but i like the locals.
The UCC is another. The General Synod declared the denomination to be Open And Affirming.
LGBTQ+ Justice - United Church of Christ https://share.google/TNNvbaMQAn5MQjPNx
However, because the structure of the denomination is not hierarchical, the General Synod can't force every congregation to be Open And Affirming, although most are.
The website has a map so you can check on congregations in your area. The one in the picture above is in Tulsa OK.