BOB ABERNETHY (anchor): Now, ministering to the deaf. In this country, more than 25 million people suffer some hearing loss, and two million are profoundly deaf. How do they worship? How can a worship service be meaningful without music and speech? In Chicago, Judy Valente visited a deaf congregation and its remarkable priest.

JUDY VALENTE: It is ten-thirty on a Sunday morning in Chicago. Parishioners are arriving for mass at St. Francis Borgia Church. Simultaneously, at a chapel right next door, these people are also coming to mass. It is their own mass. They are deaf.

Many houses of worship have worked hard to be more welcoming to people with disabilities. But the deaf prefer to worship within their own community, and to be ministered to by other deaf people.

FATHER JOSEPH MULCRONE (Pastor, St. Francis Borgia Church): It's a hearing world. And most churches tend to be focussed on hearing religious experiences: song, spoken word.

VALENTE: What goes on here is not only the mass. People arrive two hours ahead of time. Some will stay another three hours afterward.

LYNN GALLAGHER (Deaf Woman): I'm the only one in the family ...

VALENTE: Like Lynn Gallagher, most of the deaf are born into hearing families. They have grown up with a sense of isolation.

MS. GALLAGHER: It was very lonely. I always felt very, very lonely. I do truly feel very much like this is my second family.

FATHER MULCRONE: There are deaf people who are angry sometimes, "Why was I born deaf?" Not so much sometimes angry as, "What's the reason -- what's the purpose for this?"

VALENTE: At Father Joe's church, as it is called, the pews are filling up. But the fact is that, while still in childhood, many deaf people become alienated from religious services.

FATHER MULCRONE: Your parents take you on a Sunday, and they bring you to this large building. And you go into this building. And for an hour all these people are doing this. (mouths silently). And you're deaf and you look around, and you see sometimes people are happy and sometimes people are pondering. And you don't get it.

VALENTE: Before the mass begins, these deaf children go to religious education class. They are taught both orally and in sign language.

Religious education teacher: God tells us always to help, help each other. Because we show love. So we're gonna walk quietly into church now.

FATHER MULCRONE (To members of class): Good morning.

VALENTE: Father Mulcrone entered the deaf ministry because two of his grandparents were deaf. Since even the best lip-readers only comprehend about half of what they see being said, every minister in this church knows sign language. The deaf are not just attending -- some are leading the service.

FATHER MULCRONE (At Mass): So I'm gonna ask Peggy to please come up and do our first reading from the Old Testament.

VALENTE: Peggy Franco, who is deaf, signs the reading.

MARY WRIGHT (Parishoner): This is a reading from the prophet Isaiah.

VALENTE: Mary Wright watches Peggy from her pew, and recites the passage aloud, for the hearing people who have accompanied deaf members of their family to mass.

MS. WRIGHT: Look around you. See, the people are gathering.

VALENTE: Mitchell and Laurel Raci, both deaf, come to mass with their daughter, L.J., who is hearing.

L.J. RACI: I do remember when they would come to church with us when I was little, and I did often wonder what they were getting out of it.

MITCHELL RACI: There was no signing and no interpreting. And I just daydreamed in church. I didn't learn anything.