I don’t think it’s the source. I think it’s a tool of social control that enables the powerful to create a bare minimum willingness to be ruled. For a long time the doctrine of Christianity was the Divine Right of Kings. Now it’s the Prosperity Gospel. The books did not change but the people with all the money and power ensured the church leaders who served their interest had most of the money and thus followers.

If we didn’t have religion, some other social construct would arise, and I’d argue, has arisen to fulfill it’s role. Modern economic theory justifies the current power order in an unfalsifiable way that reminds me of religion.

Religion could be a liberatory force in society. In fact it has been. The liberation theology movement in South America and numerous heretical movements in the late medieval period are both examples of progressive Christian social movements.