Tony Blair says he didn't talk about it, because he didn't want people to think of him as "a nutter." But he says his religion was "hugely important" to him during his 10 years as Britain's prime minister.
Speaking on a BBC TV program charting his years in power, Blair says he shied away from discussing his faith because open discussion of religious conviction is not as common in Britain as it is in countries such as the U.S.
Blair is a member of the Church of England, but also frequently attends Catholic services with his Catholic wife, Cherie.
Blair says his faith helped him cope with the pressure of making tough decisions, including sending British troops into war in Iraq. He says without "that strength, it's difficult to do the job."