Christianity, in fact the majority of monotheistic religions, view God as a being, a person, an entity. Essential qualities and characteristics of God vary from religion to religion and sect to sect; however, to my knowledge every single one views God as a spiritual person, usually (although not exclusively) a man.
I believe that this view of God severely limits our ability to understand God. Worse than that, we create God in our own image. God becomes denigrated from an limitless Divine Mystery, to a character limited to our own understanding of ourselves. In a number of religions, Christianity included, God often takes on the primary role of judge, further relegating God to an automaton, devoid of free will.
Limiting God in this way crucifies God. God is hung on a cross, relegated to a certain role, and summarily executed. God no longer becomes a divine being of infinite quality, but a bleeding, impotent mess.
Deconstructing this view of God allows a greater understanding of the potential of God. God is no longer relegated to a specific role. Furthermore, God has the ability to reveal Godself in new and unique ways that God the person would be able to.
So what is God? In my understanding, God is the sum of all things which we do not understand–the Divine Mystery. To the extent that we do not fully understand ourselves, God is at work within us. To the extent that we do not and may never fully understand the processes of the natural world, God is at work. To the extent that we do not understand the origins of the universe, the intricacies of the human body, or the matter and energy which make up subatomic particles, God is at work.
Any practice which helps us reach new levels of understanding becomes an act of worship. Science, education, meditation, seeking solitude, hospitality and communion all help us better understand that which is a mystery to us. They help us understand God.