The foundation of faith is belief, but that bedrock can easily be shaken by doubt. And within the confines of certain religious strictures, doubt is an indication of moral failure, a step away from a personal relationship with God and the religious community at large. For some, that stumble leads to an inward journey that eventually sees them recommit to their faith and their God. But for others, that initial feeling of misgiving is the tentative start in moving away from a faith they perhaps never fully committed to in the first place. And it’s that latter scenario that marks the intriguing starting point of Hulu’s “The Path,” an engaging new drama series that investigates the turmoil that brews at the intersection of uncertainty, devotion, and the quest for power.