How could Creationism be taught in public schools without violating the Constitution?

Why can't it be taught as an option? You can teach evolution and creationism according to many types of religion. I feel exposing children to all kinds of ways that people think and believe helps them to understand people better, it gives them understanding and compion for people with different beliefs. It can also show where similarities are. There is never a problem with teaching children a lot. It is when there are taught too little that they become stuck wi th one way of thinking. I say teach them as much as possible about how the world works and what people think and believe. Let individuals make choices for themselves about what they want, show them the options and let them choose what they feel in their heart.