I am so sorry to hear your parent are limmiting you.
But i must say that the post above makes sense to me! I guess one day somehow your parent will find out anyway, or you will have to tell them..they are your family. It is not easy hiding somehtign like that from you family, the people who love you and will always be with you.
I understand that especially for your Mom it will be hard to except, but maybe not? who knows?
You may ttry talk to her and mention it in a conversation, just to know what she thinks of such...without giving her a clue that you are bi...(you mean be sexual? sorry i don`t know what exactly bi is)
How old are you? You can`t make any decissions of your own?
It`s really sad to hear that parents force something on their childred, her christian beliefs have nothing to do with you. She can keep going to church and let you study where you want to.