That’s not what they want. It’s not a matter of using their preferred pronoun. What they really want is to penalize you for disagreeing with their choice.
They were born that way but keep in mind that the way they were born can change.
This happened with Irons Church up in the Pacific Northwest. A cross-dressing man got involved and was included "as a woman" for quite a while. But when a woman's weekend retreat was announced and the man wanted to join them "as a woman," he was apologetically declined for the obvious reason that the retreat would involve intimate spaces for overnight accommodations with other actual women. Of course, the cross-dresser immediately blurted out his ordeal to several of many homosexual propaganda outlets, who made the story go viral nationwide overnight, but what did the church expect to happen?
Now, the Gaystapo has a church doxing site, ChurchClarity, which targets churches which won't accept them fully as "hateful bigots."