Religious leaders across the country this week vowed to mobilize their congregants to push for gun control legislation and provide the ground support for politicians willing to take on the gun lobby, saying the time has come for action beyond praying and comforting the families of those killed.

A group of clergy members, representing mainline and evangelical Protestants, Catholics, Jews and Muslims, plans to lead off the campaign in front of the Washington National Cathedral at an event on Friday timed to mark the moment a week before when a young gunman opened fire in a school in Newtown, Conn.

The cathedral will toll its funeral bell 28 times, once for each victim, including 20 children, 6 teachers and school administrators and the mother of the killer, as well as the gunman, 20-year-old Adam Lanza, who shot and killed himself.

“Everyone in this city seems to be in terror of the gun lobby. But I believe the gun lobby is no match for the cross lobby,” said the Very Rev. Gary Hall, dean of the Washington National Cathedral, in an impassioned sermon on Sunday that has become a rallying cry for gun control. People in the cathedral’s pews rose and applauded.