My daughter (22F) came out to me (56F) as a transgender man. What the hell should I do?

My husband and I are very big Christians, and our children were also brought up to be Christians as well. Our two oldest sons are doing well. Both are married with children, work jobs that pay them well, and attend church regularly. As for our daughter, well... she WAS doing well until she turned 19. She then decided that she doesn't believe in God anymore. Now, she wants to be a man that dates women. I feel like I failed as a parent. I can't let this happen. What should I do?
My daughter (22F) came out to me (56F) as a transgender man. What the hell should I do?
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