Photo ~ US pop-star Madonna performs during her current world tour

Catholic Youth Crusade Against Madonna in Poland

Singer Madonna is courting controversy again ahead of an August 1 gig in Warsaw, having already been threatened with legal action in France for projecting a swastika on an image of far-right party leader Marine Le Pen.

A group of young Catholics has launched an online petition to have the concert cancelled as it coincides with the Polish capital's annual World War II commemoration of the 1944 Warsaw Uprising against the city's Nazi's occupiers.

As of Tuesday, the petition had gathered 31,000 supporters for the "Material Girl's" concert to be called off out of respect for the estimated 200,000 people who died in the doomed 63-day uprising by Polish partisans.

It [the online petition] also slams the 53-year-old Queen of Pop's on-stage antics as "attacking the Catholic faith... offending Jesus Christ by burning crosses and wearing a crown of thorns" as well as promoting homosexuality and pornography.

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