I'd find a professional who counsels couples, and I'd work from the proposition of removing obstacles to the relationship rather than "freeing" her from religious excesses. Because I believe it's best in the long run, if a long run is your intention, that you not be the instigator of her break with religion, but of a positive improvement in your ability to communicate and work together.
Obviously, the religious problem is going to be a big part of the process, and it will be much better if that comes from a therapist than from you. A decent therapist sees people whose lives are disrupted by religion all the time.
It is--and I mean no disrespect to anyone here--like training a cat. You might possibly smack bad responses out of someone, but you're much more likely to become an object of some resentment, even if it's kept hidden from you. Start with getting some expert guidance in communicating. And best wishes to you.
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