A school that promoted See You At the Flagpole prayer events ahead of time (as well as an assortment of other Christian activities) also lost in court.
From the decision:
The Defendants have not identified any secular purpose supporting the flagpole event. They argue that the Supreme Court has never extended its Establishment Clause jurisprudence to foreclose private religious conduct during nonschool hours merely because such conduct takes place on school premises where elementary school children are present, citing Good News Club, 533 U.S. at 116. In fact, Defendants contend, courts have upheld a student group’s right to engage in morning prayer at the school flagpole, relying on Westfield High Sch. L.I.F.E. Club v. City of Westfield, 249 F. Supp.2d 98, 118 (D. Mass. 2003).
The Westfield case mentioned only briefly that the school permitted a L.I.F.E. club to meet before school at the flagpole for morning prayer. 249 F.Supp.2d at 102.
The critical fact in Westfield was that the religious activities at issue were student-initiated and student-led.
This is about the constitutionality of these actions he's taking, as well as the warlike nature of the Christmas sermon.