So the idea was that, some catastrophic event had happened. There was a long dark age and then out of that, 100 years ago in this world, seven barons - these men and women - rose up and formed the new society. It's a feudal world, a part feudal barons and part warlord and part mob boss and they each control a huge resource so that there's an uneasy alliance, but they all need each other.
We are well aware that religion is not as bad an influence as it was a short time ago, as history is counted. But it is a sufficiently bad influence even in modern times, and its reduced viciousness (in practice) is due plainly enough to its reduced power.