Honestly your post was quite hard to read. But a I gleaned a couple of things from it: generally you're confused and have feelings for a woman who has come out to you as gay or bisexual but seems to still be giving you mixed messages. She also seems to be using you for favors while not returning your affections or clarifying her feelings for you.

There is an easy way to cut through the confusion: Ask her what, exactly she feels for you and is she or is she not interested in you romantically. If she says NO. Then accept her as a friend only, or don't. Then move on. Period.

If she's confused about her sexuality that's her business and not for you to figure out or fix for her. You have to take care of your own feelings.

Side note: Gay can be Christian too. Many of them are. The two do not exclude each other.