What happened to Catholics going to confession? What happened to beliefs about sin?

In the movies, the penitent enters a confession booth, kneels, and whispers to a priest behind a lattice screen: "Forgive me father, for I have sinned."

This drama was, for centuries, at the center of Catholic life. But in recent decades, the number of Americans who go to confession has plunged to a shocking degree that church leaders have struggled to explain.

But Father David Michael Moses knows what happened during Holy Week this year, when he spent 65 hours "in the box" at his home parish, Christ the Good Shepherd in Spring, Texas, and at St. Joseph near downtown Houston. In all, heard 1167 confessions.

"We are talking about a lot of sin, and lots of grace," he said. "It's about offering people help and hope. In the end, Jesus wins all the battles that people bring with them into confession. That's what confession is all about."

The 29-year-old priest began hearing confessions at 6 a.m. on April 4, as Catholics made their way to nearby office towers. He continued until midnight, with a parish volunteer noting there were 100 people in line at 8 p.m. Another priest arrived two hours later, and everyone had an opportunity for the Sacrament of Penance.

"You keep thinking: 'Do I go slow and just do my best? Do I try to speed things up?' What you can't do is let anyone feel that they were turned away," said Father Moses, a Houston native who is the son of a Baptist mother and Lutheran father who converted to Catholicism.

Hearing confessions "is hard. It's exhausting. But there is nothing in the world that I would rather be doing, right now. This is what it means to be a priest. This is about salvation and the care of souls."

As recently as the 1950s and 1960s, researchers said about 80% of American Catholics went to confession at least once a year. A clear majority said the went once a month.

Then the numbers began falling -- sharply.

With Catholic leaders still sweating after the Extraordinary Synod on the Family firestorm, Pope Francis has once again tried to cool things down -- by publicly affirming core church doctrines.

The question, however, was whether Catholics could balance edgy front-page headlines about sex, divorce, cohabitation, homosexuality and modern families with the pontiff's orthodox sermons, which have received very little ink in the mainstream press.

"We know that today marriage and the family are in crisis," said Pope Francis, opening this week's Vatican conference on "The Complimentarity of Man and Woman in Marriage." It drew 300 leaders from a many world religions, including Islam, Judaism, Hinduism and several branches of Christianity.

Rather than yielding to the "culture of the temporary," the pope said, it's time to stress that "children have a right to grow up in a family with a father and a mother. ... Do not fall into the trap of being swayed by political notion. Family is an anthropological fact -- a socially and culturally related fact. We cannot qualify it based on ideological notions or concepts important only at one time in history. We can't think of conservative or progressive notions."