Was the Apocalypse of Peter Originally Part of the New Testament?

The Apocalypse of Peter was a reasonably popular book in some Christian churches of the first three or four Christian centuries.  It was not as massively influential as the four Gospels or the writings of Paul, but even so, a number of Christian individuals and churches saw it as a Scriptural text, written by Peter.

The book is first mentioned in the Muratorian Fragment, a late second century text written from Rome, which discusses the books that, in the anonymous author’s opinion, made up th...