The church is reported to have used harsh methods to put pressure on individual lawmakers who are supporting the legislation.
Archbishop Charles Chaput of Philadelphia, has allegedly said lawmakers are 'betraying' the Church by supporting the proposed new law.
One Republican legislator, Mike Vareb, accused the archbishop of using mafia-style tactics.
He told The Guardian: "This mob boss approach of having legislators called out, he really went right up to the line.
"He is going down a road that is frankly dangerous for the status of the church in terms of it being a non-profit."
American tax law means that non-profit groups, like churches, are not meant to engage with politics.
The proposed state bill would allow alleged victims of sexual abuse to file civil claims against their abusers, as well as anyone who knew of the abuse, until they are 50 years old.
However the law at present means that victims can only file suit until they are 30 years old.
The proposal passed the state lower house in a vote in April but has been stopped in the state senate, and some speculate that it might not pass.
If passed, the new legislation has the potential of costing the Catholic church tens of millions of dollars following a number of abuse allegations in the state.
Ken Gavin, a spokesperson for Archbishop Chaput, has denied claims that the archdiocese is attempting to "shame elected officials from the pulpit."
He has clarified that the archbishop sent a letter explaining why the Church was opposed to the bill.
It was sent to 219 parishes throughout the area, which had then read it out or made available during Mass.
Jamie Santora, a Republican legislator has admitted that he has been accused by a high ranking church official of 'betraying' his church.
Speaking to The Guardian he said: "I don't feel I did betray my church.
"Growing up Catholic gave me the ability to vote the way I did. To me that was the morally correct vote, by choosing victims over abusers."
The spokesperson for the Philadelphia archbishop said: "Elected officials are accountable to the people who elected them.
"There's nothing odd in that. It's how the system works."
