Besides the Bible, my # 1 required reading book would be J.R.R. Tolkien’s The Lord of the Rings trilogy. It is hands-down the best thing I’ve ever read besides the Bible. A lot of it seems to draw on biblical motifs, also, but, regardless, it’s just hard to beat LOTR for an overall feel-good, good-guys-win kind of book.
We had to read Jack London’s The Call of the Wild & White Fang when I was in high school, & I really enjoyed both of those also. Cheaper by the Dozen was also a great one, as was To Kill a Mockingbird. OK, so it was supposed to be just one…sorry! LOTR is still # 1 on my list, though!