Thus, those souls falling within a certain range of resemblance lend themselves to being clubbed together as a distinct group. Likewise, other souls which are approximately alike within their own range fall into another group. Now bear in mind that just as the body requires food for its physical needs, the soul also requires nourishment for its spiritual needs. Each soul-group requires its own spiritual diet. In mundane terms, think of it as a matter of digestion.
Religions provide food for souls, but the menu differs.
There are many religions, because different soul-groups need to be provided with different spiritual diets. Each religion is a different bundle of spiritual precepts and practices, because soul-groups differ from each other in their spiritual character and needs. A particular religion provides the particular spiritual diet that is required for, appropriate to, and digestible by a particular soul-group. An unbreakable spiritual chain interlinks a soul, a soul-group, and a religion. A soul belonging to a particular soul-group has a particular spiritual requirement which only a particular religion is designed to satisfy.