The futility of their thinking.

Here is something the antitheists would not want to see getting around - Russell is still one of their most hallowed patron saints.

"Hard, in fact, were the problems which Bertrand Russell faced in 1950 in his lecture series at Columbia University. 'The Impact of Science on Society', the topic on which Russell lectured, must have appeared a painfully hard impact indeed for anyone aware of the impending race from atomic to hydrogen bombs and beyond. What made that infernal race appear even more hellish was the hatred animating it. The racial hatred which had almost ruined the world was followed by class hatred, of which there is no end in sight yet. Trapped in that race of destruction and hatred man could but feel, regardless of his science, or rather partly because of it, completely at a loss about the meaning of his existence. Since the recovery of meaning could not be had without an escape from hatred, Russell could assign as a remedy only a love which was strong enough to cope with hatred. The only such love was Christian love, the only love which ceases to be itself when it ceases to be a love of one's enemies. To propose that love as the only solution must not have come easily to Russell. Forty years earlier he had made the philosophical and literary scene with his panegyrics of the blind world of atoms with no room for honesty, purpose, and love. Now he had to face the cynicism of all those whom he had entertained for forty years with his gospel of agnosticism and atheism: 'The root of the matter is a very simple and old-fashioned thing, a thing so simple that I am almost ashamed to mention it, for fear of the derisive smile with which wise cynics will greet my words. The thing I mean, please forgive me for mentioning it, is love, Christian love or compassion. If you feel this, you have a motive for existence, a guide in action, a reason for courage, an imperative necessity for intellectual honesty.' [The Impact of Science on Society, Russell, 1953, p. 92]" [The Origin of Science and the Science of its Origin, Jaki, 1978]

It would probably be difficult to find a situation that more compellingly exposes the "futility of their thinking" than someone of this worldview having to ask forgiveness of his audience for mentioning the idea of Christian love and compassion.