"... Zephaniah is generally considered to be a pseudonym used by an anonymous writer who either believed that he was writing in the spirit of the biblical prophet ... it is fairly clear that the writer was a Jew. In the surviving portions of the text that deal with doctrines as basic as judgment for sin, intercessory prayer, and life after death, there is nothing distinctively Christian. The lack of Christian elements is even somewhat surprising when we remember that the manuscripts came from the library of a Christian monastery. They were preserved by monks, and in all probability copied by monks from earlier manuscripts that had been translated from Greek to Coptic within a Christian community ... however, there is no clear example of any such modification of the text. The closest point of contact with Christian writings is found in the Akhmimic text. At 2:1-4 there is a close parallel to Matthew 24:40f, and Luke 17:34-36. At 6:11-15 there is a description of the angel Eremiel that has several features in common with descriptions of angels in Revelation. At 10:9 there is a quotation containing the word katechoumenos, which is used in a sense frequent in patristic texts. Nevertheless, each of these parallels may be rather easily explained as due to a common Jewish-Christian heritage. The most important point to observe is that in the surviving fragments there is no evidence of any Christian modification of any of the major theological concerns expressed in the work ..."

Charlesworth, James H. The Old Testament Pseudepigrapha (p. 501) Doubleday, 1983