The Archdiocese of New York is accusing its insurance company of waging a “shadow campaign” against the church by moonlighting as a sex abuse victims’ rights group.

The bombshell claims of “fraud and sabotage” were made as part of a lawsuit filed by the archdiocese against Chubb, the insurer defending it against more than 1,500 child sex abuse claims.

“Newly discovered evidence reveals that, since at least 2023, Chubb has been fraudulently posing as a victims’ rights organization known as the ‘Church Accountability Project’ and attempting to undermine and weaken the Insured’s’ defense,” states the complaint filed in Manhattan Supreme Court.

The archdiocese has an existing case against Chubb in a dispute over whether the church or its insurers are responsible for payouts in sex abuse cases.

It accuses Chubb of being the force behind the “Church Accountability Project,” a website that attacks the archdiocese and supports alleged victims.

“The insurance purchased by the Archdiocese is designed to cover accidents, not to compensate for deliberately concealing a pattern of abuse,” the site states.

“Chubb has pressed for transparency and accountability for years, yet the Archdiocese repeatedly refused to share crucial details regarding what they knew and when,” it adds.

“Insurance excludes this type of conduct for good reason as covering it would reward those who facilitate criminal behavior, rather than those who take vigilant steps to protect children.”

In the court filing, the archdiocese said Chubb recently confirmed its role with the group attacking the church, and said was seeking punitive damages over it.

“Knowing the insureds face more than 1,500 Underlying claims involving allegations of the gravest magnitude, Chubb reassured them to their face while secretly stabbing them in the back for years,” church lawyers said in the filing. “Such fraud and sabotage easily meet the threshold for moral culpability necessary for punitive damages.”

A source close to the church claimed that Chubb was trying to force the archdiocese — which serves 2.8 million Catholics — to declare bankruptcy so that it would have to pay out fewer claims in sex abuse litigation against the church.

Other Catholic dioceses, including Albany, Rockville Centre and Rochester, filed for bankruptcy protection under the crush of sex abuse claims.

Chubb, in its response, said church officials are to blame for covering up decades of sexual abuse.

“This filing is the latest desperate tactic to delay justice and distract from the decades of horrific child sexual abuse the Archdiocese of New York enabled and concealed,” a Chubb spokesperson said.

“Rather than taking responsibility, the Archdiocese of New York has diverted resources it could have used to compensate deserving victims, to financially stand up a purported victims’ rights group that has never once asked the Church to be held accountable.”

The insurer added: “It’s quite telling that the Archdiocese is more outraged about the facts coming to light on a platform we created than they are about the abuses they condoned, concealed and covered up.”

“The Archdiocese is delaying payment to deserving victims and failing to provide insurers needed information,” Chubb said.

The archdiocese in December agreed to negotiate a settlement to compensate 1,300 people who have accused priests and staff lay members of child sex abuse — and is working to raise $300 million to cover the cost.

“As we have repeatedly acknowledged, the sexual abuse of minors long ago has brought shame upon our Church,” Cardinal Timothy Dolan wrote in a public letter at the time.