Spirituality, at least what I mean by it and what people mean when they criticize midichlorians for “demystifying the Force”, doesn’t really mean dealing with a higher power. There’s a materialistic explanation for the Force, the source of a Jedi’s power, and Anakin’s conception. Just because you can kind of squint your eyes and use a religious word to describe it (“God”) doesn’t mean that midichlorians aren’t totally material.
Well it’s all subjective as these things often are. It’s a good thing we can’t all see things the same way.