We live in the 21st century. There is an Internet. There are passports. There are exciting opportunities to live abroad and add another language to one's brain while enjoying a variety of new experiences. There is career mobility.
You are preaching to the choir, here. If I weren't flexible, then damnit, I'd date only girls six feet tall or above, because fuck, I've forgotten at 6'7" what it's like to look into a girl's eyes on level with my own. I'd only date girls who are artistically brilliant and in the springtime of youth, and are also constantly exercising to improve their physical condition. I'd only date girls who like the Chrono series or play video games a lot. And maybe I'd only date girls who listen to the same music as I like.
But I don't, because I can appreciate almost anything, and there is so much to learn. Through my good friends, I've learned about writing a different style of poetry; about traditional Chinese music; about pilates; about framing art; about certain cultures; and most interestingly, about different personalities, minds, and human essences. All these things are wonderful.
Worldviews and religious beliefs are different. They shape an identity from the very core.
Edit: And besides, we are the future. Non-religious people come out of the closet gradually because of the extreme social pressures upon them, but they're coming out. Bill Maher pointed out in Religulous that they already make up a chunk of the US population larger than several powerful lobbyist groups. My example will help them, in the end. If it doesn't work out with her, then I know there's someone like me, wondering if she herself should just give up because the world is apparently so religious that to find someone who fulfills her would be to render herself alone until death. At some point, someone has to have the courage to stand up. There will always be the Hero.
Edit: That's a good fan art...