As one who lives a religiously observant lifestyle, I've always been a bit of an outlier on the topic of religiously motivated supernatural beliefs like these. I don't believe in souls for the same reason I don't believe in a Cartesian duality of the mind and body. Any rationally grounded support for such a belief vanished as soon as we developed reasonable alternative and scientifically motivated theories of the mind.
However, for some reason my mind's stubborn refusal to let me believe in the supernatural has not eroded my sense of religious commitment. I think this is because I realized long ago that the crux, and contemporary import, of religion for me (and this is entirely my opinion, and mine alone) is not in instilling belief in any specific historical event or supernatural phenomena, but rather instilling the notion of belief, in the broadest sense, deep within every individual.
This is ultimately what differentiates humanity from all other forms of life that we know of. That is, we are conscious creatures (mostly) capable of lofty pursuits, and there is value in exploring unknown territory and working together with other human beings to achieve great things. These are religious concepts at heart, because they are predicated on the belief that human achievement and the pursuit of knowledge are not merely the means to some material end. The journey itself is the point.
