RD, I had a long post typed up, but it got swallowed by the intertubes. This one will be shorter.
I disagree with the common stance that you should stay out of it. A person's choice of faith is personal, but their expression of it is public. The practice of religion should be intellectually tested by the practitioner as well as the people in their life. She knows and respects you as someone who is thoughtful and well spoken, as well as
involved in her life.
I am a bit dubious about your intentions, however. Your goal should be to help her fully understand her choice intellectually, not to dissuade her from making that choice. In order to rationally do this,
you need to fully understand her choice. To that end, you should attend services with her, at the place of worship she is investigating.I'm sure you see the benefits of this approach, rather than "taking her to a better church", you'll learn more about
her choice and be able to come from a place of inclusion and knowledge, rather than exclusion and ignorance. The side benefit to this is that you'll find out the "defenses" she is being taught regarding the most commonly attacked portions of this belief system. If you use those attacks, the pupil will immediately go into a defensive posture, and spit out the learned response; it's best to avoid this heheh.
Since I've said the above, I feel that I should say this as well (in the interest of you fully understanding your beliefs
)
Dude, you're being a freaking bigot. You want her to believe what you believe, further, you don't want her to believe what you don't believe. Stating that it would be okay for her to be an Atheist and that even being an anti-Christian Atheist would be preferable to the choice she is making kind of gives you away.
Talk with her about it, don't talk to her about it.
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"Dress cops up as soldiers, give them military equipment, train them in military tactics, tell them they’re fighting a ‘war,’ and the consequences are predictable." —Radley Balko