You believe that there is a god - where an agnostic only believes there
might be - but you don't feel that any of the mainstream religions paint a reasonable picture or anything you'd really want to believe in, right?
I think the term you're looking for then is "deist." Deism generally means that you believe there exists some kind of higher power, but not necessarily that it wants our worship, or that it even pays any attention to us. Generally, a deist thinks that there's no way to know what god is like, so there's no reason to subscribe to any particular religion. And I can certainly agree with you that the common vision of the christian god is not really a very appealing one.
That help you any?
The atoms that make up you and me were born in the hearts of suns many times greater than ours, and in time our atoms will once again reside amongst the stars. Life is but an idle dalliance of the cosmos, frail, and soon forgotten. We have been set adrift in an ocean whose tides we are only beginning to comprehend and with that maturity has come the realization that we are, at least for now, alone. In that loneliness, it falls to us to shine as brightly as the stars from which we came.