If the commonalities of spiritual systems are unreliable, the differences don't matter . The universe doesn't need a maker for it to be. Spirits are not necessary for gestation . Love is chemistry . Life doesn't need a maker.
Geology is understood, and punctuated equilibrium is the key.
Hominid evolution is understood. No particular religious hero is unassailable. Religion has a history , but that does not necessarily mean a goal-oriented process is occuring. Morality and ethics are social inventions. Patterns are not necessarily indicative of artifice or of intent .