Christians primarily uphold the Bible as their sacred scripture. However, there are other writings and texts that some Christians regard as important, but do not consider as canonical scripture. One notable example is the Apocrypha, which includes books that are found in the Septuagint (the Greek translation of the Old Testament) but are not included in the Hebrew Bible or in the Protestant versions of the Old Testament.
Different Christian denominations have varying views on these texts. For example, the Roman Catholic Church includes the Deuterocanonical books (which are part of the Apocrypha) in the Catholic Bible, while most Protestant denominations do not accept these books as scripture.
Additionally, texts such as the Gnostic Gospels, which include writings like the Gospel of Thomas and the Gospel of Mary, are considered significant by some groups but are not recognized as canonical by mainstream Christianity.