Horrifying stories abound in the 900-page report on child sex abuse by Roman Catholic priests in Pennsylvania — yet they will likely lead to no new prosecutions, authorities said Wednesday.

One priest raped a 7-year-old girl while visiting her in the hospital after her tonsillectomy; another forced a 9-year-old boy into oral sex — then rinsed his victim’s mouth with holy water to “purify” him.

But more than 100 of the abusive priests are dead, and virtually all of the cases are too old to be prosecuted under Pennsylvania’s statute of limitations.

“They’ve either passed away or they’re out of statute — so because of the coverup there won’t be a whole lot of justice that comes out of this,” said University of Pennsylvania law professor and child abuse activist Marci Hamilton.

Some 300 priests molested some 1,000 children in cases spanning back to the 1940s, according to the sweeping report, the result of a two-year grand jury investigation.

Other priests — including Donald Cardinal Wuerl, who spent 18 years as bishop of Pittsburgh and who is now archbishop of Washington, DC — enabled abuse by allegedly covering up complaints.

According to the report, three convicted clergymen, Francis Pucci, Robert Wolk and Richard Zula, belonged to a “ring of predatory priests” in Pittsburgh that made their own kiddie porn on diocesan property, including churches and rectories.

Favorite boys were identified among ring members by large gold crosses they were given to wear, the report said.

In 2011 in Allentown, a victim accused Monsignor Thomas J. Benestad of abusing him from 1981 to 1983, beginning when he was 9 years old, recalling that after the abuse, Benestad would squirt holy water into his mouth “to purify him.”

The monsignor was allowed to retire and lives in Boca Raton, Fla., the report said.

The Rev. James Beeman of Lancaster allegedly assaulted a girl four times, including when she was hospitalized at age 7 in 1961.

Beeman has been allowed to retire to “a life of prayer and penance,” the report said.

The Pennsylvania Attorney General’s Office has only prosecuted two clergymen named in the report.

Robert D’Aversa, 71, and Anthony Criscitelli, 64, were sentenced in May to five years’ probation for child endangerment for letting a third, abusive cleric continue to be around children.

“It’s a common problem in these cases,” said former Brooklyn federal prosecutor Bradley Simon. “The climate until recently was different. People didn’t speak out, and unfortunately, it’s too late for these victims from decades ago.”

In general, only a third of victims disclose the abuse while they’re still a child, said Hamilton, who heads the child-abuse legal reform group CHILD USA.

Another third never disclose; the average age of adults who do come forward is 52.

With Wires