Sometimes LGBT people have to walk away from over-zealous religious families (especially the ones that think "homosexicles is the demon!" and "pray" to stop it). If you're lucky, your folks aren't quite as superstitious as your grandma, but I can tell you right now that your mom ditching Glee proves she has a pretty livid hatred for homosexuality. I would have to say that since you are an adult, look into getting out ASAP. An LGBT person stuck in such a hateful environment (whether it's religious or not) really needs to seize their independence as an adult to explore and express their identity. My family had issues with my transsexuality for non-religious reasons, and it made my life hell for a few years, until they came around and accepted it. I don't really think this will happen with your folks.
Time and distance usually helps. If you come out and prove that you can be a happy and successful member of society, they may make and "exception" for you. A lot of religious people find themselves doing that. The thing is, they might not. Instead of asking yourself whether or not you want to be with your family... the question is WHEN are you prepared to LEAVE them? Because you MUST be true to yourself, no matter what.