Amanda,
Congratulations on your coming out. I came out about a month ago at work. I will go full time in the fall after recovering from FFS. I also expect that some who have been accepting in theory may be less so when they see the reality of my change. I think we can only control what we do, not what others do. My plan is to hold my head up, be respectful of others, and do my job as well as I can. People may hurt me. It is kind of part of the path we take I guess. I hope to be able to concentrate on the supportive people. Heck, I have been miserable too long living as the wrong person to allow some ignorant person to ruin this for me. I am quite scared of that first day back, but I refuse to give in to any negativity from others or myself.
I am sad that your brother is using religion to, intentionally or not, hurt you. I hope, given time, he will come around. I wish for you the strength to fight for your happiness. Good luck.
Moni