Without the letters of condolence, telegrams of congratulations and even occasional postcards, the friendship of a separated friend is not a social reality. It has no existence without the rites of friendship. Social rituals create a reality which would be nothing without them.

Just in our lifetime our society has become looser and more private, it becomes extremely difficult to hold to any permanent commitment whatever, least of all to organized religion.

Religion can make it worse. Are you supposing that if people were encouraged to believe in a transcendent reality, and to be encouraged by grand rituals and music and preaching, to love their neighbors, then they would put jealousy and frustration aside?

Islam is in principle egalitarian, and has always had problems with power.

It seems true that the growth of science and secularism made organized Christianity feel under threat.

It is very reasonable to worry about the harm done by organized religion, and to prefer looser and more private arrangements.

The theory of cultural bias... is the idea that a culture is based on a particular form of organization. It can't be transplanted except to another variant of that organization.