Not only in the structure of society, but in the general peace of mind of the people who practice it (Christianity anyway). Personally, even if you could prove to me definitively that Jesus never existed*, I'd still follow him. The gospel fits so perfectly with my understanding of morality and justice that I couldn't ever turn away from it and be at peace with the world. *obviously he's so well documented (even by his enemies) that that'd be impossible, but hypothetically