Why do people argue over religion?
Because too many people’s “personal relationship” with God come with the baggage of demanding they also get to move into the social and political rooms of everybody else’s lives. The history of the animosity between some religious groups (Muslim to Christian, Protestant to Catholic, etc.) colors the attempts at ecumenical discussion in a sort of school-yard “you hit me first” immaturity, even though the actual truth is they came in contact over issues about geography, social value systems, and even “God likes me best” tirades whose origins are threaded in the history of power, not religion. Less intelligent people have a great difficulty understanding the difference between a “subjective opinion” and “objective evidence”.