They currently have no answers, okay.
How do you know they will point toward the existence of some spiritual mechanism? We don't currently have any answers to them, how do you know what the answers are going to be? UFO's, multiple universes, ancient technology, a sixth sense, even ghosts may have incredible answers that still won't point toward a "spiritual mechanism." Of course, we may find that they can be answered by less than incredible means.
Okay, so any of them could lead to the bankruptcy of atheism. But given our current understanding of any of these topics none of them do, and that's kind of the point. For example, if we get conclusive evidence that there is a God, that totally bankrupts atheism. However, as of now we do not have conclusive evidence that there is a God, so I don't believe in one. Furthermore, if it turns out there is a god, or gods, and not the Christian one, does that not bankrupt Christianity?
Again, perhaps I fail to see your point.