The only god should be allowed to judge you part bodes well for you.
Playing the open mind approach should put them in presentation mode to make you think well of them. Your doing so openly should show your friend how much you are trying for her.
I like Abraham Lincoln's approach to religeon "When I do good I feel good. When I do bad I feel bad. That is my religeon". He really had some great lines.
If they get all hardcore hitting Genesis or insisting everything is true you could have a wee bit of fun and innocently ask about "Cain's wife".
Born and still am Catholic but with a few tweaks

Life is all about choices after all how can we be fairly judged if we are not truly free to make our own choices.
Like I tell my kids by all means listen to anyone who wants to talk. Take what is of use to you and don't get hung up on the rest of it.
In the end it's an opportunity both to meet people and show your friend how much you care so should be win/win really.