For religions to be good drivers of conflict, their mix of incentives needs to be changed. Most of their present incentives tend toward moderation and excessive reliance on the secular establishment for support. That is why flavorless state religions are so prevalent - they are by far the easiest kind of religion to build and maintain, and secular rulers like them because they are docile and firmly under state control. Furthermore, they act as an inert barrier to expansion by more militant and less pliable faiths that might destabilize the realm with their presence.
