Ok, I am back.
I want to write a little more about my experience.
I had (or, have) a very similar struggle. I don't know even how to tell my dad yet, but I don't have a rush to do it. I understand that they are your parents, however if you are going to create them pain, and therefore create you pain as well, why tell them? Wait, give them hints and show them how a good person you are. I am doing that with my dad and hopefully everything will be ok. And also waiting until you are totally independent from them is something wise to do, just in case they kick you out of your house. IF THEY REACT BADLY, YOU NEED TO UNDERSTAND IT IS THEIR PROBLEM, NOT YOURS (caps for emphasis)
Also, how can I be dating such a wonderful person and still find it difficult to say things like, "I'm gay, and this is my girlfriend"?
You might.... you are comfortable with her and you really like her, however you might not be that comfortable with yourself to be "out" and have no struggles when talking about it. Also consider the fact that the fear you have about your church friends and family of disowning and rejecting you is a huge barrier that will block you from saying "I'm gay" and "this is my girlfriend". Work hard, have patience and love yourself. I am sure your girlfriend will support you in everything, so make sure you talk with her about what you're going through . :)
Good luck, and if you want to talk about anything, I am here to help in everything I can. :)
-Jean.