I think it's just the case that as beings develop a degree of sentience, they are capable of recognising that mutual assistance is beneficial for all, so when they see another in need, the compulsion to help becomes overwhelming. You see it even with intra-species examples, not just humans protecting animals, but apes assisting small birds, kittens, young humans, dolphins assisting divers etc
There are examples of mutual assistance in animals that lack the same degree of individual capacity for thought, bees, ants etc, small mammals that live in communal groups, packs of dogs, but it's clear the reasons for that are not based on a logical thought process, but rather hormonal and instinctual factors.
While it's true that dogs will assist humans of their own volition, I don't know of a case whereby a colony of ants has gone out of their way to assist a human in distress, whereas dolphins are known to behave entirely altruistically to assist others, even beings of a completely different species.
It's all wonderful, but again, I don't see how any of it necessitates a god or a creator.
In terms of religions claiming hegemony of morality, I think that's something exclusive to some of the more dictatorial organised religions, and it's an aspect of them that I find particularly distasteful. I have been told, for example, by a priest that if I do not believe in god, then I could not possibly have loved the deceased relative he was busy eulogising. Now while I accept that not every adherent of that religion would say the same, I'm sure you can see why that is not only highly offensive, but also shrieks of rank hypocrisy when atheists like myself are constantly told we are being 'rude' or 'offensive' simply for asking questions and trying to reconcile contradictions.
I will admit that there is a part of my atheism that is driven by sheer outrage and indignation at what organised religions get up to, but that's by far and away a minor part of it compared to the myriad of things I simply can't reconcile with the supposed existence of deities. I concede that I'm inherently sceptical, but not to the point whereby I wouldn't be open to changing my view if faced with some sort of compelling argument or evidence. Unfortunately, I've yet to see any evidence whatsoever, and I accept that this is not required by people who profess 'faith', but more than that, I haven't encountered any compelling argument for the existence of deities either, at least, nothing that serves in anyway to reconcile my questions. It's invariably all 'hand-wavium', 'mysterious ways', 'beyond our ken' etc.