Well......I would say community for one. If you aren't in a crazy person hall, it can be quite nice. Ready made friends, little things to do. Its a ready made community.
Second i would say its EASY to excel. If you can place a couple phrases one after the other, you qualify to be a scholar basically.
Third I would say that that since their is plenty of hypocricy in Christianity, that they offer an alternative (seemingly less hypocritical from the surface), and the happily ever after appeal of living on earth forever in a life that you know and is familiar to you now.