It seems quite evident that Murray's comments and participation are indicative of governmental endorsement/support of religion. I sent a complaint about this to the Freedom From Religion Foundation and the FFRF recently sent a letter to the school district/principal in question.
The letter notes, "It is clear that federal law dictates government employees should refrain from actively participating in religious activities while acting within their governmental role to avoid any perception of government endorsement of religion and/or excessive entanglement with religion. Your quote, as reported in the local media, gives the impression that your official support for the students at the event crosses the line from supporting their right to assemble to supporting the theology implicated by the "See You at the Pole" event" and "... even if SYATP events are student-initiated, faculty members are prohibited from participating. Such participation violates the Establishment Clause."
The FFRF and I await a response from the principal. You can read the FFRF letter in-full below:
FFRF letter sent to Abington Heights PA
FFRF letter sent to Abington Heights PA