Friend (27F) of many years declined to be in my (27M) wedding because it?s a gay wedding.

So yesterday I asked my friend, F27, since 4th grade to be in my wedding party. We have been good friends of many years and I was so excited to ask. We ended up meeting at a restaurant and I had a little gift and card for her. When I asked her she made a sad face and then proceeded to try to explain she cannot be in my wedding because she does believe that marriage should be between two men. She said she just can stand up there with me because she cannot support this type of marriage with her faith (Christian.)
She said she talked to her mom, who agrees with this decision, but then said she still wanted to attend and even help with other parts of it.
It obviously hurt my feelings and now I don?t know what to do. How would I even go about continuing this relationship if she can?t support one of my biggest life moments.
She also seems like she doesn?t wan your friendship to be strained or change, but how can it not be? How do I do about this?
TLDR: Friend of many years said no to being in my wedding because it goes against her Christian beliefs. What are the next moves?


Source.