Human souls are energy sources that gods feed upon in the aether realm. This pushes them to interfere with the mortal realm and gain followers through worship. Messiahs, prophets, and all manner of holy men are used to establish religions and various belief systems in order to garner human beings to their deities. When that human dies, the god that has "dibs" on that soul claims it in the afterlife to feed off of it. For this reason, they compete amongst each other, trying to gain as many followers as possible.
Their is a realm that sits between the material and aethereal world called limbo. This realm is divided into two parts, the first of which is called "The limbo of the Patriarchs". Agnostics who did not worship any particular god, or atheists who rejected the idea of god altogether reside here. As they are unclaimed by any deity, Their souls are up for grabs and can be taken by either side, leading to many conflicts between gods over the rights to them. The other half of this realm "The realm of Infants", contains the souls of children who were unable to be born. Infants that were miscarried or aborted, or children who were born dead, reside here. The gods generally leave this part of limbo alone.
Approximately 113 billion people have been born and died throughout history, not counting human subspecies. This would mean that the number of children who, for whatever reason, were not born when they should have been would be much higher, making their side of limbo more highly populated. Although they don't serve as a suitable meal for a god as individuals, the quantity of souls altogether in that realm would make for a great feast. Yet, the gods do not bother with claiming the souls here as their own, cursing them to wander aimlessly in this cold, grey realm for an eternity.
Why would competing gods ignore such an obvious source of power when it could aid them in the war against each other?