One man's religion is another man's belly laugh

Robert A. Heinlein said

"One man's religion is another man's belly laugh."

Had it been true, with so many religions around the world, everybody in the world would be laughing.

"One man's religion is another man's nightmare"

is the world order due to two religious groups i.e., missionary evangelical Christianity and Jihadi islam. They divide the world into two distinct categories: themselves vs non-believers (called heathen or kafir). These two groups are extremist in nature and distinct from their mainline beliefs i.e., Christianity and Islam. 

Hillary Clinton once said.

"In every religion, there are those who would drape themselves in the mantle of belief and faith only to distort it's most sacred teachings -- preaching intolerance and resorting to violence".

Civilized World has taken a serious note of Jihadi Islam. Though evangelical christians committed the some of the worst crimes unfolded in history, but escape the dragnet due to their excellent public relations skills.