Madonna’s upcoming concert in Poland has hit a snag after a Catholic group announced plans to protest the show.

A committee for the Catholic Society is hoping to keep the Material Girl from taking to the stage in Warsaw on August 15, which coincides with the Assumption of Mary feast – a holy date in the Catholic Church.

A Catholic Society representative maintains the controversial pop star’s shows on her Sticky & Sweet Tour are anti-Christian and would conflict with the religious celebration.

The group has urged Polish government officials and tour promoters to cancel the show – but if the performance goes ahead as planned, the assembly has promised to “stifle Madonna” by staging a picket line outside the venue.