Somehow the idea of a gang of "specially trained priests" running after a gang of kids seems wrong...
"A group of children perform a ritual and open the gates of hell, allowing every single demon to roam on earth.
A powerful satanic book gets lost from the Vatican archives and five centuries later it shows up in America, only that a group of children lay hand on it and perform a ritual which opens the gates of hell and let loose all demons on earth. A group of specially trained priests must stop all these demons before Satan takes over the world. After studying advanced grammar and writing a book I went into screenplay writing."