Here "pest" is a metaphor for a person who causes trouble. Alternate translation: "this man to be a trouble maker" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The phrase "Nazarene sect" is another name for the Christians. Alternate translation: "He also leads the entire group whom people call the followers of the Nazarene" (See: [[rc://en/ta/man/translate/figs-explicit]])