The Prime Minister has suggested he's not a very good Christian in the latest comments on his personal faith.
In an interview with The Times, Boris Johnson also said Christianity made sense to him.
"Christianity is a superb ethical system and I would count myself as a kind of very, very bad Christian," he said.
He added, "No disrespect to any other religions, but Christianity makes a lot of sense to me."
Johnson's faith has become a point of speculation again after he married Carrie Symonds in a Catholic ceremony at Westminster Cathedral earlier this year.
Johnson is the first Prime Minister to have been baptised Catholic.
Last September, Wilfred, his young son with Carrie was also baptised a Catholic.
But he has not commented publicly on whether is he actually a Catholic now.
Last month, when he was pressed on the question by ITV News' Robert Peston, he refused to answer.
Mr Johnson told him: "I don't discuss these deep issues, certainly not with you."
He then quoted from Psalm 14 and told Peston "the foolish man has said in his heart there is no God".