But science still can't tell me why I found it satisfying.

I suspect that, that's because our feelings, our likes and dislikes, are very complex things.  If we could understand the role of all the brain chemicals, if we could be aware of all the interractions between brain cells, know all the memories and put all of these into some supercomputer which could tell us what we're going to think next, that computer might be able to give us a scientific explanation for our likes and dislikes, but it would be so complex that, even if we could understand such an explanation, it would take us so long to do so that we'd be old decrepit people by the time we got to the end of the explanation for just one 'like' or 'dislike'.

So we need a shorthand for talking about such things - things of the heart that we know really matter to us. Things that bring us pleasure and real joy, things that make life worth living, bring those feelings of real solid satisfaction without any hollowness of the sort we get when we serve only ourselves. 

That, ISTM, is really what talk about God is. 'God' need not be some supernaural 'other' who is outside the universe looking in and changing things, 'God' can equally mean something within us and between us, something that is an integral part of us, both as individuals and in community. 'God' need not be a powerful creator of galaxies and planets, but rather a creative power whithin us that changes the world to be a better place.