This idea may be used in secular schools in the USA, at homes, at churches and other places.
http://www.cefonline.com/ministries/
https://en.wikipedia.org/wiki/Good_News_Club
I called Child Evangelism Fellowship and the lady who answered the phone said this Supreme Court ruling allows Child Evangelism Fellowship or someone who uses Child Evangelism Fellowship materials to use them in secular schools in the USA if there is a another organization or school organization meeting in the school building. Below are online articles on why it is legal to have Child Evangelism Fellowship Good News Clubs in some secular schools in the USA.
Child Evangelism Fellowship
Please go to this website and put the word supreme in the search engine.
http://www.christianitytoday.com/ct/2001/august6/14.24.html
https://www.cefonline.com/good-news-clubs/415-2001-supreme-court-ruling
