The UN is the United NATIONS as NATIONS, NOT the United RELIGIONS.
No government leader, whether a true Christian, a professor, or follower of another religion or none should attend this UN meeting. It is not their sphere of responsibility.
We have had a diet of ridiculous news stories regarding simple low key acts of faith being accused of being the "establishment" of religion in America (e.g. letting christians meet together as christians in public schools, public displays of the 10 commandments).
This is a real attempt by the UN to regulate, oversee and establish whatever they say about religion. Wake up!
Professors may go ... and get along. Followers of Jesus, on the other hand, may go and preach Jesus the Son of God crucified and raised from the dead as the only Way to God and salvation. Making it clear that all other ways lead to Hell.