RIO DE JANEIRO (AP) - Hundreds of thousands of young people who slept under chilly skies in the white sand of Copacabana beach woke up Sunday in eager anticipation of Pope Francis' final Mass for World Youth Day, the culmination of the emotional homecoming for the first Latin American pope.
The mayor of Rio de Janeiro estimated some 3 million people would turn up for Sunday's Mass, and hours before the service even began, nearly the entire 4 kilometer (2.5 mile) crescent of Copacabana's broad beach overflowed with pilgrims, some of them taking an early morning dip in the Atlantic.
The all-night beach party had a festive air, with pilgrims wrapped in flags and sleeping bags to ward off the cold. They danced, prayed and sang - and stood in long lines in front of the armadas of portable bathrooms along the beachfront.
"We were dying of cold but it was worth it," said Lucrecia Grillera, an 18-year-old from Cordoba, Argentina, where Francis lived for a time before becoming pope. "It was a tiring day, but it was a great experience."
Francis headed into the final hours of his first international trip riding a remarkable wave of popularity: By the time his open-sided car reached the stage for the vigil service Saturday night, the back seat was piled high with soccer jerseys, flags and flowers tossed to him by adoring pilgrims lining the beachfront route.
The vigil drew a reported 3 million flag-waving, rosary-toting faithful, higher than the 1 million at the last World Youth Day vigil in Madrid in 2011, and far more than the 650,000 at Toronto's 2002 vigil.
Many of those watching the vigil had tears in their eyes as they listened to Francis' call for them to not be "part-time Christians" and to build up their church like his namesake, St. Francis of Assisi, was called to do.
"Jesus offers us something bigger than the World Cup!" Francis said, drawing cheers from the crowd in this soccer-mad nation.
After Sunday's Mass, Francis meets with the bishops of Latin America and the Caribbean, as well as a thank-you audience with some of the 60,000 volunteers who organized the youth festival. He leaves for Rome Sunday night.
Saturday night's vigil capped a busy day for the pope in which he drove home a message he has emphasized throughout the week in speeches, homilies and off-the-cuff remarks: the need for Catholics, lay and religious, to shake up the status quo, get out of their stuffy sacristies and reach the faithful on the margins of society or risk losing them to rival churches.
In the longest and most important speech of his four-month pontificate, Francis took a direct swipe at the "intellectual" message of the church that so characterized the pontificate of his predecessor, Benedict XVI. Speaking to Brazil's bishops, he said ordinary Catholics simply don't understand such lofty ideas and need to hear the simpler message of love, forgiveness and mercy that is at the core of the Catholic faith.
"At times we lose people because they don't understand what we are saying, because we have forgotten the language of simplicity and import an intellectualism foreign to our people," he said. "Without the grammar of simplicity, the church loses the very conditions which make it possible to fish for God in the deep waters of his mystery."
In a speech outlining the kind of church he wants, Francis asked bishops to reflect on why hundreds of thousands of Catholics have left the church for Protestant and Pentecostal congregations that have grown exponentially in recent decades in Brazil, particularly in its slums or favelas, where their charismatic message and nuts-and-bolts advice is welcome by the poor.
According to census data, the number of Catholics in Brazil dipped from 125 million in 2000 to 123 million in 2010, with the church's share of the total population dropping from 74 percent to 65 percent. During the same time period, the number of evangelical Protestants and Pentecostals skyrocketed from 26 million to 42 million, increasing from 15 percent to 22 percent of the population in 2010.
Francis offered a breathtakingly blunt list of explanations for the "exodus."
"Perhaps the church appeared too weak, perhaps too distant from their needs, perhaps too poor to respond to their concerns, perhaps too cold, perhaps too caught up with itself, perhaps a prisoner of its own rigid formulas," he said. "Perhaps the world seems to have made the church a relic of the past, unfit for new questions. Perhaps the church could speak to people in their infancy but not to those come of age."
Francis asked if the church today can still "warm the hearts" of its faithful with priests who take time to listen to their problems and remain close to them.
"We need a church capable of rediscovering the maternal womb of mercy," he said. "Without mercy, we have little chance nowadays of becoming part of a world of 'wounded' persons in need of understanding, forgiveness and love."