Since 1980 it has been legal to teach the Bible in public schools based on the Supreme Court decision Stone v. Graham. The best way would be to teach it in all grades, so kids would learn truth before they grow old enough to drop out or do major crimes. But schools have been dragging their feet. In Clatskanie Oregon, superintendant Ed Serra said it would have to come down from Washington before he'd have the Bible taught and school board chair Stuart Hass said he wouldn't go there because there has been too much controversy in the past.
What we need is a nation wide effort to go to school board meetings and demand they obey current law of the land instead of the obsolete decisions made from 1947 through the 1960's. Any and all effort might help -- individual requests to teams of legislators going from district meeting to district meeting to lawsuits. Jay Sekulow and others stand ready to defend Christians in school lawsuits.
Among the benefits of teaching the Bible K-12 is kids would eventually better understand the Bible with 12-13 years of study than pastors with only 4 years of study in college. That would tend to reduce the liberalism taught from some pulpits. The Bible is the most condensed collection of powerful ideas known. Eventually a population of Bible experts would require a new kind of church life where the lecture format is replaced with free speech meetings led by the Spirit like the 3 hour prayer and Bible study at the first meeting of Congress.
As Bible kids inherit the nation they would have built in resistance to the corruption we're experiencing in government today. A Christian Congress and President would help make this a free Christian nation as the Founders intended which would become a testimony to all nations.