The crusade against a proposed mosque near Ground Zero turned Biblical Sunday as a fire-and-brimstone Florida preacher declared that those behind it will "burn in hell."

"All these people will die and burn in hell," Bill Keller told a crowd of 40 people gathered to hear his sermon at the New York Marriott Downtown overlooking Ground Zero.

"Islam is not and has never been a religion of peace," he said. "How could you build bridges with people who ask their Muslim brothers to fly a plane into the twin towers and killed thousands of innocent people?"

It's inflammatory rhetoric like Keller's that has supporters of the mosque most worried: They say it is wrong to tarnish the entire Muslim religion because of the actions of a few.

Many opposed to the Park51 project have also dismissed the Muslim-bashing preacher, fearing they'll be lumped in with his bigoted and racist views.

Keller says he is raising funds to create a 9/11 Christian center near what he calls the "victory mosque." Sparing few others the rod, he also leveled equal condemnation toward Hindus, pro-choice supporters and even Mormons - including Fox News' Glenn Beck.

Meanwhile, a group of Republican leaders - including scandal-scarred former Congressman Vito Fossella - joined in the fight at a 9/11 memorial in Staten Island yesterday. Standing with Fossella was Long Island Rep. Pete King and Carl Paladino, who is seeking the Republican nomination for governor.

"No matter what stage the project is in at the time I enter office on Jan. 1, I will stop it," Paladino vowed. "They will move it some place else."

lalpert@nydailynews.com