I think about that as an atheist. I get a big kick out of other peoples' delight, and I feel invigorated if I helped the process. Maybe it's empathy... I feel happy when I hear the thump, thump, thump of my dogs' wagging tail or the purr of a cat. I do good things probably because it makes me feel good.
I can't bear witness to anguish or suffering without feeling it on some level myself. I think humans are wired to share in the joys and sorrows of other sentient beings, and religion is just one of the many stories people tell themselves about why they do what they do. Feelings are often primal and instinctive and we don't necessarily know why we feel them or how to control them. I think stories of gods and demons and so forth were the best explanations we could come up with in the past when trying to use language to make sense of emotions and share that information with others.
Doh! Self-Interest explains everything doesn't it?
Just like God does.
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