What you are proposing couldn't be taught as science. Social studies, perhaps, for the lower grades?
The proponents of Creation Science would be loath to acknowledge other creation myths, Native American for instance, as being on par with their own. They might compromise with the Genesis version being taught in science class and the others relegated to some other classification. But I can't believe for a moment that they would allow "equal time" for all creation myth variations.
(:raig