The Heroes' Journey (15x10) ruined the entire show for me

the implication that sam and dean actually cant do anything at all without the help of god is so so stupid. EVERYTHING they've ever accomplished was because God willed it and not due to their own skills, which doesn't make any sense at all because theyve been trained by their dad and hunting for their entire lives. if it was just the small stuff like lactose intolerance and dental issues then itd be pretty funny, but they can't pick a lock? Sam can't watch where he's walking anymore?