Religion has itself evolved around humans. We keep on adapting it to our needs and understanding of the world. And yes, of course the religious leaders, just like politicians will end up using religion to take advantage of the human nature and manipulate the masses. Most people will follow because a lot of the mechanisms which helped us evolve, also make us prone to religion. The current monotheistic religions are currently facing a crisis because they are starting to get outdated. Cultures also evolve and the old religious books are starting to have no place in our society. Most probably though, religion will also evolve in certain ways in response. It may change so much that monotheistic religions will become just a part of human history but whatever new appears, it will be based on the same principles that all religions are based on.