Thiests call it God and the Athiests call it Nature - its again the Jargon that differs!
Athiesm talks about to Humans who have become great by good deeds and spirituality talks about people who have become Great (Gods) by, again, Good Deeds.
Thiests call it Ganga and Athiests call it H2O.
Thiests pray at Temples where as Athiests pay respects at conferences.
Sorry if I sound stupid, but I dont really find a major differene between two forms of life :))