Bill Maher -- Catholics Demand Boycott ... One Priest Joke Too Many

The leading Catholic rights group in America wants to organize their own hate campaign -- because they hate the anti-religious hatred they claim Bill Maher spews on his show ... and now it's calling for network execs to kill Bill's show for good.

The Catholic League -- which has had issues with Maher for years -- now say "Real Time with Bill Maher" finally crossed the line after a recent guest went nuts bashing Catholicism.

The guest -- author Dan Savage -- was ragging against a bishop who claimed kids adopted by gay parents have a higher chance of suicide. Savage's retort: "He's confusing children of gay parents with children who are raped by Catholic priests." Dan referred to them as "kiddie-f***ing Catholic priests."