We can Stalk the Sunday Worshippers all day but Not the Satan Worshippers

Scripture:Acts 13:6,9-10 [6]And when they had gone through the isle unto Paphos, they found a certain sorcerer, a false prophet, a Jew, whose name was Barjesus: [9]Then Saul, (who also is called Paul,) filled with the Holy Ghost, set his eyes on him, [10]And said, O full of all subtilty and all mischief, thou child of the devil, thou enemy of all righteousness, wilt thou not cease to pervert the right ways of the Lord?