How do I tell my parents I don't want to go to church?

There is never an easy way to tell your parents that you don't want to go to church, especially if it is a big thing in your family and you're from a religious household. Try sitting them down the day before the church service and explaining to them why you don't and how you are feeling. They might not agree or understand at first, but at least you can say that you communicated with them instead of lying to them and yourself

Perhaps you could just mention that it's not something you feel like doing. I don't know how seriously your family takes their faith or how they will react, but they should respect your desire to not do something you don't feel comfortable with.

This can be a delicate situation depending on your reasons and how your parents are. You want to be respectful but at the same time you want them to respect you. The best way to tell them that you don't want to go to church is to be direct, no cutting around the bush. Assert but no aggression.

I've been there! I would be straight up with them. Tell them how you feel about it and let them know that you mean no disrespect to them or to the church but that it's just not something that you want to do. I'm not sure of your reasoning (whether you just don't enjoy it, you don't feel like you believe the same as them, etc.) but just put things gently so that they know how you really feel and don't think you just wanna back out of it for no reason.

Communicate in a reasonable and logical manner why you don't want to go to church, try not to be overly aggressive and be careful about your tone of voice because that itself can lead to another argument that could snowball into potentially hazardous problems.

You explain to them it doesn't interest you or that you don't understand and it just won't make anything of it taking you there if it won't change you.

Just be honest with them. Personally I'm agnostic. I don't go to church because I don't believe in anything in particular. I told my mom about 3 years ago I didn't want to participate in church activities anymore. She said that was completely fine. It was my decision and she supported me.

Strongly, firmly, and swiftly. As the muggles say, truth will out. Hold your ground, and don't be too upset if they don't react the way you want them to.

Tell them that you want to explore the world and find out more about faith by not going to church for a while

I think it's important to remember that they will see your personal choice and feelings as a reflection on them and their values ( no matter if that is wrong ) so try to be as calm as you can when breaking the news. It's going to be hard on them to hear and the more calm and respectful you are the more open (hopefully) they will be to listening. Remind them that this is your personal choice and this is a journey you need to make of discovery on your own and you don't think you're going to find it in a Christian church. Remind them that you still need their love and guidance but that you need to find your spiritual needs filled somewhere else and would like their support in finding wherever that might be.