The terrible error in the course of human civilization is undoubtedly the defective judgment that allowed religious authorities usurp the foundation of societal morality, in which all collective ethics of humankind must take a cause. This appalling blunder is comparable only to assigning the leper exclusive franchise to run beauty clinics in the society; this can only lead to cycles upon cycles of common infection syndrome.
The supernatural worldview is causing a great number of otherwise intelligent people to cling to a collection of atavistic concepts that have not, and never will serve humanity in any ultimately beneficial way. Any benefits that spirituality ostensibly provides to its adherents, can be found equally in the worldview of philosophy and ethics, communities of other kinds, and so on. It's a myth that the only morality, hope, purpose and comfort to be found, resides only in the supernatural.