I would argue that a teacher lead Christian, (or Islamic or Buddist or Hindu or Muslim) prayer is clearly Unconstitutional and the Supreme Cort has ruled this way. Under our Constitution this is how it works. Also, I taught in a public school for 15 years and anyone can pray whenever they want. It is simply Unconstitutional for me to lead them in a prayer professing my religion.
The Ten Commandment can be posted by any private institution or individual. A specific religion can not be prommoted by a public institution. The Courts agree with this no matter how confident you may be in your interpretation of the Constitution. If your local county placed a sign with Muslim or Buddist teachings on their property I predict you may see the problem of promoting a religion on people of other beliefs.
Our Court System has made these rulings:
U.S. Supreme Court Decisions on Separation of Church and State
Engel v. Vitale, 82 S. Ct. 1261 (1962)
Any kind of prayer, composed by public school districts, even nondenominational prayer, is unconstitutional government sponsorship of religion.
Stone v. Graham, 449 U.S. 39 (1980)
Court finds posting of the Ten Commandments in schools unconstitutional
No matter how strongly you disagree with the Constitutionally established courts these rulings are the law of the land so it appears there is some separation of church and state.
Any examples of countries controlled by their religious leaders (past or present) that have worked out well?
The global warming connection --- lots of hot air!
Loren