In a recent email interview, the computer scientist and cultural critic David Gelernter shares his thoughts on a variety of topics, among them the effects of the decline of religion on American society. (Interview by Conor Friedersdorf.)

[F]aith in the Judeo-Christian religions is dramatically weaker than it used to be. But human beings are religious animals, and most will find an alternative if the conventional choices are gone.

The readiest replacement nowadays for lost traditional religion is political ideology. But a citizen with faith in a political position, instead of rational belief, is a potential disaster for democracy. A religious believer can rarely be argued out of his faith in any ordinary conversational give-and-take. His personality is more likely to be wrapped up with his religion than with any mere political program. When a person’s religion is attacked, he’s more likely to take it personally and dislike (or even hate) the attacker than he is in the case of mere political attacks or arguments. Thus, the collapse of traditional religion within important parts of the population is one cause of our increasingly poisoned politics. Yet it doesn’t have to be this way. . . .

It used to be that nearly all American children were reared as Christians or Jews. In the process they were given comprehensive ethical views, centering on the Ten Commandments and the “golden rule.” . . . As a result American were not paragons; but they had a place to start. Today many or most children in the intellectual or left-wing part of the nation are no longer reared as Christians or Jews. What ethical laws are they taught? Many on the left say “none, and it doesn’t matter”—a recipe for one of the riskiest experiments in history.

Two extraordinary events demonstrate something important about Israel’s most fervent adversaries. One was a speech given at something called The People’s Forum (funded generously by Goldman Sachs), which stated, “When the state of Israel is finally destroyed and erased from history, that will be the single most important blow we can give to destroying capitalism and imperialism.”

The suggestion that this tiny state is the linchpin of a global, centuries-old phenomenon like capitalism goes well beyond anything resembling rational criticism. Even if Israel were guilty of genocide, apartheid, and oppression—which of course it is not—it would not follow that its destruction would help end capitalism or imperialism.

The other was an anti-Israel protest that took place in front of New York City’s Memorial Sloan Kettering Cancer Center, deemed “complicit” in Israel’s evils. At organizers’ urging, participants shouted their slogans at kids in the cancer ward, who were watching from the windows. Given Hamas’s indifference toward the lives of Gazan children, such callousness toward non-Palestinian children from Hamas’s Western allies shouldn’t be surprising. The protest—like the abovementioned speech—deliberately conveyed the message that Israel is the ultimate evil and its destruction the ultimate good, cancer patients be damned.

The fact that Israel’s adversaries are almost comically perverse does not mean that they can be dismissed. If its allies fail to understand the obsessive and irrational hatred that it faces, they cannot effectively help it defend itself.