He uses uncertainty to challenge the scientific consensus ...
One of the things Mr. Berlinski's book demonstrated is that the "scientific consensus" regarding fundamental facts about the universe doesn't really exist. Scientists theorize all kinds of different and contradictory things, but proving or observing them to be true is a different matter.
Plenty of sane, intelligent and educated people - with a doctor's note, IQ and SAT scores, and college degrees to prove it, Mr. Harris - find much of what scientists say on these topics to be unpersuasive. "This doesn't make any sense, and not only that, you can prove any of it, so why should I believe you, instead of the equally 'scientific' guy with a totally different theory. Why should I believe either one of you?" I suppose I'm radically skeptical, too. This might impress my kids ...
Nertz. “CAN’T prove ...”
Back to the kitchen. I probably split an infinitive, too.