Original sentence: The idea is promulgated by Young Earth creationists and biblical literalists to support their belief in the literal truth of the creation myth in the Book of Genesis and the flood myth in the Book of Genesis during which, they contend, the ancestors of all land-based life on Earth were housed in Noah's Ark
Edited sentence: The idea is promulgated by Young Earth creationists and biblical literalists to support their belief in the literal truth of the creation narrative in the Book of Genesis and the flood myth in the Book of Genesis during which, they contend, the ancestors of all land-based life on Earth were housed in Noah's Ark