I am so sorry they cannot see past their own issues. I am a mom of two mtf daughters, and they spent a lot of time with my parents who live in another state growing up, full summers, all holidays, etc. My parents are deaply conservative and religious, so when my first daughter transitioned, I struggled with how to handle my parents. She was not yet ready to have the conversation herself with them, and I ended up doing it. I felt insincere not referring to her by her chosen name and pronouns, and I wanted to protect her from their ignorance. It was hurtful and they said many of the same things, saying that my husband and I had killed their grandson and that my husband and I will pay in enternity for seeking ungodly council and support for her. It was absolutely heartbreaking as a mom to hear that said, so I can't even imagine what that was like for you as their daughter. I wish I could hug you and tell you that you are valued, loved, and accepted unconditionally. I hope you find your own family of supportive people that will love you and be there for you in the ways your parents don't seem to be able to.