For me, as others have said, God is a word with almost too much baggage, and too connected with authoritarian 'king' God notions.
As a Quaker and a Universalist my notion of God is that everything conceivable (and unconceivable) within the Universe is made of God; not as a personal 'man' figure, but as a force of potential. I'm a nondualist so to me there are no simple 'facts' such as 'free will' versus 'determinism', or 'good' vesus 'evil' and that these are illusory states of mind and viewpoints.
God, to me is the *thing* / *force* that 'hard wires' in my being, the feeling that doing something compassionate, loving, collaborative is somehow *right* in a way we cannot explain....... and conversely, the thing or force that leads to doing something harmful, selfish or ill-intended, just somehow feeling not right to us.
Atheists and materialists could I guess call that the 'moral compass'. To me, experientially there is no 'moral compass' to be found within the body, just as there is no separate, ego or 'self' that we can point at. So to me, 'God' is that which fills those gaps that we experience but which cannot be explained.
I mainly take my inspiration on what God is to me from the (in order): Hindu (Advaita), Buddhist* and more mystical/spiritual forms of Christianity.
*Contraversial I know.