The prayer banner has been on the school walls since the 1960s.  
 Fox Nation by Todd Starnes:  A federal judge has ruled that a Rhode Island high school must tear down a prayer banner that encouraged students to be kind and helpful, because it offended non-Christians and was a violation of the US Constitution.  

US District Court Judge Ronald Lagueux ruled that the prayer banner at Cranston High School West must be removed immediately because it promotes religion.  Jessica Ahlquist, an atheist student, had sued the City of Cranston and the high school after they initially refused to remove the banner.  

Commentary:  The corrupt courts in the world today won't even allow some public school officials to promote the attributes of God, such as kindness and helpfulness, because they are wicked and in the hands of the "prince of the power of the air."  The Bible says, speaking to God's people, "Previously, you walked according to the course of this world, according to the prince of the power of the air (satan), the spirit that now works in the children of disobedience" Ephesians 2:2.  Atheists do not want the Word of God exposed in public schools and because satan is now the prince of this world, until the Lord returns to set up His righteous kingdom, he reigns, and the people of this world will be obedient to him, their master.  Since they do not want God in their schools, or His attributes published, they will receive more of what they are bargaining for, illicit relationships between teachers and students, shootings on campus, drugs, gangs, etc..  The Bible says, "Do you not know that to whom you yield yourself servants to obey, his servants you are...whether of sin unto death, or of obedience unto righteousness?" Romans 6:16.  * The following post may be of interest to you.