1) Void Meditation during the week - man.2) Detach yourself from the emotions in church. See it as a learning opportunity. Study just exactly how and why its a lie. Do it in front of your parents. How are they going to know that your learning exactly why its nothing but propaganda (lies)? Be nice to them. Their is no reason to act out how you feel, esp. to someone that lacks the ability to understand it.3) Be creative. Theirs all sorts of fun and productive things you could do as a Satanist.4) Love your parents. Their lost in the lie. It's not your fault. Don't ever get mad or disgusted with them. Help them as best you can - their your parents! The more you learn the better you'll be able to help them.5) If I had to be nice to a Christian and go to their church, I'd have a great time. Their all in a trance! What a great opportunity!
They might have Guardians around them that see you for who you are and try to alert your parents, but Christians cannot allow themselves to believe in that. It's a fundamental part of their religion. They might act differently, but their not going to know why. They don't have a clue. Just be respectful and loving and ignore any changes in their behavior.