No doubt most of Britain’s five million Catholics do not believe exactly what Benedict believes and teaches. No doubt most of them are appalled at the Catholic hierarchy’s record on priestly child abuse, and disappointed that many of the scandal’s enablers still hold high office in the church.

But in turning out for their beleaguered pope, Britain’s Catholics acknowledged something essential about their faith that many of the Vatican’s critics, secular and religious alike, persistently fail to understand. They weren’t there to voice agreement with Benedict, necessarily. They were there to show their respect — for the pontiff, for his office, and for the role it has played in sustaining Catholicism for 2,000 years…

On Saturday, Benedict addressed Britain’s politicians in the very hall where Sir Thomas More, the great Catholic martyr, was condemned to death for opposing the reformation of Henry VIII. It was an extraordinary moment, and a reminder of the resilience of Catholicism, across a gulf of years that’s consumed thrones, nations, entire civilizations.

This, above all, is why the crowds cheered for the pope, in Edinburgh and London and Birmingham — because almost five centuries after the Catholic faith was apparently strangled in Britain, their church is still alive.