Even though the gun control debate has been relatively dormant in recent years despite high-profile mass shootings in Arizona, Colorado and elsewhere religious voices have been a key part of the gun control coalition.
"Any time this movement has made a push, whether you're looking at the Brady bill, the assault weapons ban or the 1968 Gun Control Act, faith leaders have been at the forefront of that," said Everitt, whose coalition was started by religious activists. "We can't win without them. We need them."
Faiths United to Prevent Gun Violence worked earlier this year to prevent passage of the National Right to Carry Reciprocity Act, which would have made it easier for people to carry concealed weapons, said Vincent DeMarco, the group's national coordinator.
In the wake of the Newtown shootings, DeMarco said "the possibilities are much better" to try again to renew a Clinton-era ban on assault weapons that expired in 2004.
"The faith community is committed to doing this and it makes sense and it will happen," he said, "and this sad tragedy in Connecticut is only going to add to the commitment."
His coalition of 39 Christian, Jewish, Muslim and Sikh organizations launched in 2011 after the shooting in Tucson, Ariz., that killed six and injured then-Arizona Congresswoman Gabrielle Giffords. It is affiliated with the Brady Campaign to Prevent Gun Violence.
Rabbi David Saperstein, director of the Religious Action Center of Reform Judaism, said religious leaders are already discussing possible next steps after the killings in Connecticut.
"The immensity of the tragedy and the strong religious mandate to protect the innocent and the children," he said, "clearly have created conversations in the religious communities all across America about 'What can we do?' "
Religious groups alone cannot move new legislation forward, said Saperstein, a longtime gun control advocate, but "if political leaders move, the religious community will galvanize to support it."
Speaking at an interfaith vigil in Newtown on Sunday, President Barack Obama said "these tragedies must end," and religious coalitions and denominations quickly urged the White House and Congress to act. For example:
• The African Methodist Episcopal Church urged Congress to not be intimidated by the gun lobby and to reform gun laws. "The times in which we live, and the consequences of reckless gun use, demand courage and determination from our political leaders, the faith community and individual citizens to change them," the denomination said in a statement.
• PICO National Network, a coalition of faith-based social-justice groups, asked its members to petition Obama to send legislation to Congress to renew the assault weapons ban and to require background checks for all gun buyers.
• Episcopal Bishop Mariann Edgar Budde of Washington is teaming up with the Rev. Gary Hall, dean of Washington National Cathedral, to "dedicate ourselves to the work of passing national legislation to ban the sale of assault weapons and ammunition in this country" and asked congregants to join them.
Despite the groundswell, not all religious leaders are convinced that stricter legislation is appropriate.
Joseph Mattera, presiding bishop of the New York-based evangelical group Christ Covenant Coalition, wrote in Charisma News that he doesn't agree with New York Mayor Michael Bloomberg's call for improved background checks and tighter gun laws. Mattera, instead, is concerned about the secularization of U.S. society.
"I also believe blaming guns would be to skirt the deeper issues the humanists don't want to touch," he wrote in a Saturday commentary. "Blaming guns for this and other tragedies like Columbine and Virginia Tech massacres would be like blaming automobiles for the thousands of deaths that occur every year due to accidents on highways and streets."