The meaning of this question is uncertain.
I think you may have meant to ask, "When was religion banned in schools?" In which case, I can't answer the question worldwide, but here in the United States, it never was. Students are allowed to be as religious as they want (e.g.: pray during tests, run and attend scripture study clubs for any religion, &c.).
However, in public schools, teachers aren't allowed to force students to participate in any given religion as this would violate the First Amendment to the United States Constitution that government will not respect any religion above all other religions, since public schools are ran and funded by the government, and their teachers essentially work for the government.
Many school districts have banned the Slaughterhouse Five by Kurt Vonnegut because of its prolific use of slang or "filthy" language, explicit sexual scenes, and perceived blasphemous renditions of God and Jesus Christ.
they should be banned because it is a waist of school time and money.
it is not banned it is controversal because it is not school compliant
Are You There God, It's Me Margaret was banned by a number of school libraries for being "sexually offensive and amoral". It was removed from Gilbert, Arizona elementary school libraries. In Xenia, Ohio school libraries, the book was challenged because of "sex and anti-Christian behavior." It was also banned in Zimmerman, Minnesota but the ACLU was able to reverse the ban and allow students to check the book out if their parents give permission.
There are still many banned books even today. Some banned books have become unbanned.
no
Poseidon was a Greek god, god of the sea. He had no formal education, but would have become innately omniscient about his realm.
it depends on the school but i dont think they should be banned because it gives you something to do whenever your bored:)
no chips shouldnt be banned give the chose to children
Actually, the use of Facebook can be banned at home, in school, and in certain countries.
There doesn't appear to be any evidence that Alice's Adventures in Wonderland has ever been banned in school.
The band was playing music that they were banned from singing at school.