Leo XIV urged the Catholic Church to "desperately" counter a lack of faith in his first homily as pope Friday, a day after the modest cardinal largely unknown to the world become the first US head of the 2,000-year institution.

Chicago-born Robert Francis Prevost on Thursday became the 267th pope, spiritual leader of the world's 1.4 billion Catholics and successor to Argentina's Pope Francis, after a secret conclave by his fellow cardinals in the Vatican's Sistine Chapel.

In today's world, Leo warned in his homily to assembled cardinals, there are places or situations where "it is not easy to preach the Gospel and bear witness to its truth, where believers are mocked, opposed, despised or at best tolerated and pitied".

"Yet, precisely for this reason, they are the places where our missionary outreach is desperately needed," said the new pope, 69, standing at the Sistine Chapel altar with Michelangelo's famed fresco of "The Last Judgment" behind him.

The former missionary deplored "settings in which the Christian faith is considered absurd, meant for the weak and unintelligent" and, in an echo of his predecessor Francis, said people were turning to "technology, money, success, power, or pleasure."

"A lack of faith is often tragically accompanied by the loss of meaning in life, the neglect of mercy, appalling violations of human dignity, the crisis of the family and so........

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