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Well, think about this: does she really need to know? My grandmother, whom I love to death, still thinks I'm a Christian, and everything's A-OK. So long as you keep your religion to yourself, there should be no problems. You likely don't need the extra drama anyway.

I vote on you not telling her until you're far enough away from her that she can't really do anything about it. Parents can be brutal and unfair, and just because your mother had you, doesn't mean she isn't liable to overreact to something as arbitrary as religion. Just stay the course, and you'll be fine.

I don't know your mom personally, so it's hard to give advice. Different people will take that in different ways. It depends on who your parents are. I've been blessed with awesome ones so it really didn't create many difficulties. Very young I expressed a dislike of Sunday school and going to church and eventually I wasn't forced to go anymore. I still attended some of the major holidays (hell, I still do now sometimes out of respect) but the fact that I'm not Christian isn't a problem. How flexible is your mom? If she is, you probably don't have anything to worry about if you carry out the conversation respectably.

Just tell her you don't want to go

I guess just keep going the way you are then. Go to church with her as a favor to her and don't let her know you aren't a christian yet.

Going anywhere when you doubt its validity sucks, believe me, I know. But I would not stir a pot of trouble when all it needs to do is sit for a few years. Wait it out, eventually, slowly, she'll stop taking you to church, and all will be good then. For now, if you want your situation to be guilt-free (ludicrous a concept as that is), then all you have to do is to keep thy religion to thyself. As long as you can keep that going on, you're going to be fine.

Announcing your doubt in the only thing your mother knows for sure is never a good idea, unless you know for a solid fact that she doubts it too. That doesn't look to be the case, so I'd just play along with it, if I were you.

Also, one thing I might wonder is...
1. are you sick of going to church and obeying your mother, who, it obviously means a lot to (so, yeah, emotional pressure on you AND her) or
2. do you actually disbelieve the tenants of your faith? Because there is a huge difference (in my mind anyway) between teenage rebellion/exploration and careful study and introspection to determine your connection with Divine. So... which are we dealing with here?

Well since you're not able to legally move out, it would probably be best to lay low. You could tell her if you really want to, but I would recommend that you keep quiet about it after that if she doesn't take it well.

As for church, could you pretend you're sick . . . every Sunday morning? Or bring a book