Dd came home from school singing "Jesus loves me this I know for the Bible tells me so." She attends a community school and there are only two practicing christians in her class. There are seven practicing muslims, a couple of hindu and most the children come from non religous families.
I realise that schools are required to a have a broadly christian basis to their worship, but there are loads of christian songs which would not offend non christians. Why would a school choose that hymn? I know that parents do have the right to pull their children out of assembly, but they do need warning if the hymn choice is going to be that extreme.