I asked Samuel Oliner, “Knowing all you now know about who rescued Jews during the Holocaust, if you had to return as a Jew to Poland and you could knock on the door of only one person in the hope that they would rescue you, would you knock on the door of a Polish lawyer, a Polish doctor, a Polish artist, or a Polish priest?” Without hesitation, he said, “a Polish priest.” And his wife immediately added, “I would prefer a Polish nun.”While individuals themselves are capable of being "good", in the worldly sense, without God, so long as a sufficient fraction of their contemporaries Believe, once unbelievers become a sizable minority or even a majority of the population, the society itself becomes objectively evil.
That alone should be enough to negate the pernicious nonsense that God is not only unnecessary for a moral world but detrimental to one.
But if that isn’t enough, how about the record of the godless 20th century, the cruelest, bloodiest, most murderous century on record? Every genocide of the last century — except for the Turkish mass murder of the Armenians and the Pakistani mass murder of Hindus in East Pakistan (now Bangladesh) — was committed by a secular anti-Jewish and anti-Christian regime. And as the two exceptions were Muslim, they are not relevant to my argument. I am arguing for the God and Bible of Judeo-Christian religions.
Perhaps the most powerful proof of the moral decay that follows the death of God is the Western university and its secular intellectuals. Their moral record has been loathsome. Nowhere were Stalin and Mao as venerated as they were at the most anti-religious and secular institutions in Western society, the universities. Nowhere in the West today is anti-Americanism and Israel-hatred as widespread as it is at universities. And Princeton University awarded its first tenured professorship in bioethics to Peter Singer, an atheist who has argued, among other things, that that “the life of a newborn is of less value than the life of a pig, a dog, or a chimpanzee” and that bestiality is not immoral.
Of course, even the "good" and "evil" binary taxonomy itself is a frame of the Creator. As one can see from the Singer quote in the above-cited passage, the unbeliever's rejection of God denies him the independent ability to separate right from wrong, and must rely on others to help differentiate the two. Even to the point of denying the intrinsic dignity and humanity of pre-born or newborm humans.