In 1925 a schoolteacher was taken to court for teaching evolution in the public school system. The famous Scopes Trial pushed Darwinism to the forefront of our society.
In 1962, the US Supreme Court ruled that school prayer is unconstitutional.
In 1998 the National Academy of Sciences published and distributed a book to public schools and other institutions entitled 'Teaching About Evolution and the Nature of Science.' This publication was designed to persuade and assist teachers to present the theory as fact and counter anti-evolutionist students. So, now we have digressed from the legalities of teaching evolution in our schools to a single mindset that evolution, though unproven, is the only answer to the question of human origins.
And we wonder why we are having problems with children in our public school systems!