Religion isn't something we do on Sundays, it permeates our entire being - how we live, how we feel, how we interpret our surroundings.
If the inbuilt spirituality doesn't get used in religion, it comes out in other ways. I think there is a very real need in humans for worship. But are we worshipping God, or an idol? We need to ask ourselves this.
Yes, you are right, there is something innate about it, otherwise how could we explain the fact that for thousands of years humans always worshipped something. But I think what we are talking about here is "passion" for something, not "spirituality" per say. Yes, for some people it is religion, for others it may be their work, for some it may be another person even, yet others may have some specific passion for things like art or music or whatever. I don't think we are necessarily channeling our spirituality into something else
instead of religion though, I think we are each sort of wired up to go a certain way, and we do. Some are more spiritual than others because this is the way they are wired up, others are not at all, but maybe have inclination for something else. Also, as I am sure you know, not everyone "feels" religion the way are supposed to, many just go through the motions for various reasons, but feel nothing or almost nothing. It may just not be their 'cup of tea", but they may be too scared or guilty to admit it even to themselves... That doesn't seem like a good thing.
