It means Satan knows who the True Church founded by Christ is. That is the Catholic Church. He doesn’t waste time mocking the Pentecostal dance and screaming services, the Evangelical “pulpit call” or however it is referred to nor any other of protestant scripture reading and music service which you guys call worship.
It may be a form of "false flag" psychological warfare. It may simply serve to antagonize Catholic beliefs, and possibly to set up/reinforce false ideas about transubstantiation / the sufficiency and efficacy of Christ's once-for-all sacrifice on the cross.