The main thing to do is care and protect yourself. It can be very hard to come out, especially to parents who are religious, but that being said, does not mean you should suffer for it. You are who you are, and that is beautiful.

It's natural to have a fear of rejection. I promise you. We live in a society that does not nurture us discovering our gender identities. That is not your fault. It is a very scary thing. You're not alone in this.

My advice, since she is religious, is to take this slowly. Have small, safe conversations about this. Even in a neutral, non-home setting may make this easier.

Your safety is the most important here.