The prime minister, an Anglican, had reportedly expressed an interest in joining his wife Cherie and their four children in the Catholic faith.
The Blair family priest, Father Timothy Russ, told The Times newspaper Mr Blair "may well" convert.
But Mr Blair emphatically denied the story when challenged by reporters, joking: "Don’t they run this once a year?"
Fr Russ, the priest who presides over communion at Chequers, said it would be "unwise" to speculate on whether Mr Blair would convert but added "it might well end up that way".
Mr Blair had even asked him: "Can the prime minister of Britain be a Catholic?," he told the paper.
But asked by reporters in Budapest, where Mr Blair is attending a Progressive Government conference, whether he was planning to convert, he said: "I am saying no.
"Don’t they run this once a year? I think they do." (Source)
I think I will pray for Tony Blair’s conversion and in fact I encourage you to do so also. Maybe I will call this The Blair Switch Project.