Religion, whatever it is, is a man's total reaction upon life, so why not say that any total reaction upon life is a religion?
 William James, The Varieties of Religious Experience (1902). copy citation

Context

“Whatever then were most primal and enveloping and deeply true might at this rate be treated as godlike, and a man's religion might thus be identified with his attitude, whatever it might be, towards what he felt to be the primal truth. [pg 035] Such a definition as this would in a way be defensible. Religion, whatever it is, is a man's total reaction upon life, so why not say that any total reaction upon life is a religion? Total reactions are different from casual reactions, and total attitudes are different from usual or professional attitudes. To get at them you must go behind the foreground of existence and reach down to that curious sense of the whole residual cosmos as an everlasting presence, intimate or alien, terrible or amusing, lovable or odious, which in some degree every one possesses.” source