Problem with that is, while "school" is mandatory, "Sunday school" isn't. Not all children in our society attend Sunday school. For them to receive information on both
evolution and creationism, in order that later they would be able to make their own
informed choices and decisions, both would have to be taught to them in the only instructional environment where attendance is mandatory.
Creationism is not based in scientific practice. In fact, it contradicts several other sciences, geology & astrophysics among them. It's not for public institutions to limit science curricula teaching, in order to include what is essentially belief based concepts, solely because some people don't like what actual scientific practice has deduced, across several completely different scientific branches, not just evolution