How did religion "ruin" Quantum Leap? It was one of the show's central pillars.
Maybe. They kept it ambiguous most of the time, generally referring to "God or fate or whatever" as being behind the leaps. Some intelligence was directing Sam, but it was never made explicit what it was. After all, as I think I mentioned several pages/years ago in this thread, networks have always been uneasy with religious themes in TV shows for fear of offending people, so they prefer leaving it as vague and ambiguous as possible.
I was kind of partial to the idea that Ziggy was the one controlling Sam's leaps in order to bring about the future Ziggy considered best. (I think some of the Ashley McConnell novels may have hinted at that.) And didn't the series finale kind of hint that Sam himself may have been the one responsible for his own leaping, perhaps subconsciously or through some timey-wimey retroactive influence? Heck, maybe those are both true, given that Ziggy had some of Sam's brain cells in her and that their minds were linked. The combination of Ziggy and the temporally delocalized Sam as a gestalt entity may have formed some higher level of consciousness that transcended time and causality, saw the shape of all history and possibility, and caused the part of itself that was Sam to go to where and when he was needed to work toward the optimal probability state.
Then again, the show did pretty much acknowledge that Satan was real, and its Christmas Carol pastiche episode ended with an apparent miracle (though that could've been Ziggy acting without Al's knowledge, I suppose).