That sucks, and sadly it sounds like your best option is to just shut up and do the bare minimum (eg go to church) to appease your mum.
Some of those religious folk won't listen to any doubts, and although your mum means well and is acting that way because she cares, she won't bother to listen to reason. So there's no point in disrupting your relationship.
When you're 18 you don't have to deal with it.
Edit: you may even want to consider taking your mom up on talking to the pastor. A lot of religious leaders I've met are actually open minded and don't believe in force (although I don't know what your specific sect is like). This could do wonders in convincing your mum to leave you alone.. Just make sure you try to leave out your emotions and stay mature if you do keep talking about it
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Don't appease her she's insane