“Although it would be unconstitutional if only the Christian perspective is taught, other religions could also be taught.”
But that already happens, in courses with “Mythology” in the title. The one I had in high school, 50 years ago, covered the creation stories of the Greeks, Romans, Norse, Babylonians, Chinese, Japanese, Indian, First Nations, Aztec, Inca and the one in the Bible. Compared and contrasted them. There was no point in covering the Biblical creation in science classes, because there’s no more evidence that it’s more accurate than any of those other ones.