Public schools will not instill religious values (and rightly so too I might add) - there are class rules of course though (only speaking from the perspective of the school I went to myself and my own kids' school). But all rules/morals are essentially derived from bible teachings/common sense anyway. In the classrooms they have signs up that say what is and isn't acceptable and when they start school they are drummed into them and referred back to if they break any of them.