In many, or most, cases, they may not be deliberately reconciling it, or even trying to reconcile it at all. You're assuming that they all take philosophical thought on the matter, which, actually, they may not bother with. Or they may be compartmentalising the two. I don't have an issue with that, though it gets me scratching my head. We do, though, all have space in our brains for a dash of irrationality, which differentiates us from Mr Spock and gives free rein to imagination and creativity. Religion is the ultimate irrationality, though there are other examples almost as egregious, support for Man U being a case in point.