He was speaking in a European Parliament debate on last week's terror attacks in Paris by Islamist gunmen.
Many MEPs displayed signs saying "Je suis Charlie" (I am Charlie), in solidarity with Charlie Hebdo magazine, where 12 people were murdered.
A minute's silence was held in memory of those who died in the attacks.
Mr Farage, leader of the anti-EU UK Independence Party, said mass immigration had "made it frankly impossible for many new communities to integrate".
"We do have, I'm afraid, I'm sad to say, a fifth column that is living within our own countries, that is utterly opposed to our values," he said.
"We're going to have to be a lot braver and a lot more courageous in standing up for our Judeo-Christian culture." » | Monday, January 12, 2015
