I call myself an agnostic, but it's self-descriptive, not a matter of 
conviction.  My take on God is that he/she/it is the highest level of 
coordination that actually exists (in the universe).  By coordination I 
mean essentially awareness + intention + influence.  By highest I mean 
most encompassing in terms both of mass-energy and volume of space and 
also in the degree of penetration of that awareness and influence into the 
most detailed phenomena that are not everywhere identical, the details 
that comprise the evolution of events.  If the reality were that this 
description applies to a human being, I would term that too trivial, and 
agree with the atheists that God does not exist, however I suspect this is 
not the case.  Both the certainty with which the 'faithful' embrace their 
God (variously described) and that with which atheists reject the notion 
of God strike me as hubris.