They believe in 1 woman getting pregnant without having sex out of hundreds of billions and getting a divine message from God before she did.

The first part of the statement remains true no matter what you believe about the mystical part. Don't have sex and you won't get preggers, same as how a man is born a man and can only ever be a man and can never be a woman (without the mystical belief part).

It's pretty simple once you remove the irrelevant pieces.