When she says God will cure you, you should say "That would be nice. I don't talk about religion though, so let's change the subject"
When she preaches at you, just say "I have different beliefs and I don't discuss religion" then offer to change the subject, or walk away.
If she keeps on preaching at you, tell her to stop it. However, remember that all tak about God isn't preaching. This could be her special interest and she wants to talk about it. You need to be able to differentiate what is preaching to you (telling you that you need to be saved, Jesus died for you, etc) and what is discusssing (talking about her experiences or what the Bible says, or about God in general).
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I'm giving it another shot. We will see.
My forum is still there and everyone is welcome to come join as well. There is a private women only subforum there if anyone is interested. Also, there is no CAPTCHA.
The link to the forum is
http://www.rightplanet.proboards.com