On Sunday, the small but growing congregation will throw open the doors to their church at 129 N. 40th St. and the recently acquired Offutt-Yost mansion down the street. The mansion was the home of Lt. Jarvis Offutt, the first Nebraska pilot to die in World War I, and for whom Offutt Air Force Base is named.

St. Barnabas is one of Omaha’s “newest” Catholic churches in the sense that the congregation joined the Catholic faith in 2013, Catania said. It had originally been an Episcopal church.

“It was a matter of conviction,” Catania said. “Our beliefs were more in line with the Catholic Church.”

Among those beliefs, he cited the actual presence of the Lord in the Eucharist, the intercession of Mary and the teaching authority of the church and papacy.

Churches such as St. Barnabas belong to the Personal Ordinariate of the Chair of Saint Peter rather than a Catholic diocese. As part of the celebration, the Most Rev. Steven J. Lopes, bishop of the Ordinariate, will preside over Mass on Sunday.