Hi Sally,
I am sorry that you had this experience with people who call themselves "Christians." More and more churches, even some that style themselves "Evangelical" are learning LGBTQ people are, first and foremost, PEOPLE. I don't really know how to help you here. The church I attend is at best so so for LGBTQ people but they would NEVER throw out something so openly invalidating, and hostile, in the open service. If some misguided people try to pull that sort of thing in the name of the church behind the scenes (sort of to imply they have the key to how things REALLY are) the church leadership will shut them down -- HARD. I got to see that in action with people trying to "straighten me out."
I do not know your relationship to this church or how deeply involved you are. If at all possible it might be good to find a different church. Many churches are more open than you experienced. In some cases you need to look in their website for the code ONA (for Open and Affirming). That might not be the style of worship you are looking for; but the hard invalidating message you received says that particular church missed the mark.
It is difficult to be transgender and Christian. You need to find a church where they do not push the message that you are in the wrong just because you are you. They do exist.
HTH
Erin