Religion doesn't make you able to love deeper. Sometimes you love someone more, that's all. Many non-religionists feel bullied by Christianity or other major religions, because some members of those religions are bullies. They may be less tolerant of having it in their personal lives. Likewise, there are atheists and other freethinkers who are hostile to all Christians or members of major religions because some of the religionists treated them as second-class citizens.

Des, I think people of different politics and religion can get along, but I don't think that's most people. I, too, am in such a relationship; my boyfriend is Lutheran, and I'm agnostic. He's likes Bush a lot more than I do. We get along, but I eventually want to find someone who shares my political and non-religious views (or close to them), because I don't want to debate these things at home, and I want to be able to vent frustrations on these topics with someone who agrees. I can debate online and with people outside my home; I just don't want it in my home.