Why does Gregorian chant have so many ties to religion?

Question: Why does Gregorian chant have so many ties to religion!?
Best Answer - Chosen by Asker:

Because the Gregorian chant was written during a time when just about the only people performing music were monks!. So the music was sung by them about religious themes!.Www@QuestionHome@Com

It was invented by Christian monks!.Www@QuestionHome@Com