Religion solves some coordination problems very well. Witness religions outlasting numerous political and philosophical movements, often through coordinated effort. Some wrong beliefs assuage bad emotions and thoughts, allowing humans to internally deal with the world beyond the reach of god. Some of the same wrong beliefs also hurt and kill a shitload of people, directly and indirectly.

My personal belief is that religions were probably necessary for humanity to rise from agricultural to technological societies, and tentatively necessary to maintain technological societies until FAI, especially in a long-takeoff scenario. We have limited evidence that religion-free or wrong-belief-free societies can flourish. Most first-world nations are officially and practically agnostic but have sizable populations of religious people. The nations which are actively anti-religious generally have their own strong dogmatic anti-scientific beliefs that the leaders are trying to push, and they still can't stomp out all religions.

Basically, until doctors can defeat virtually all illness and death and leaders can effectively coordinate global humane outcomes without religions I think that religions serve as a sanity line above destructive hedonism or despair.