Be open and talk about your ideals. I had been teetering on the fringes for quite a long time, mostly coming to Church but not really being present, because I felt like an outcast as an older single.
Within a cultural group marriage is hard. Good communication, love, support and understanding are the things you should consider.
Don't forget too that IF you are successful in turning the lights on and deconverting her, the family would resent you the rest of their lives. If you were the one who did the asking, it is simply chivalrous and gentlemanly for you to pay for dinner, the movie, or whatever else you do.