Juniper Carol, for example, writes: ‘The first express witness in the West to a genuine assumption comes to us in an apocryphal Gospel, the Transitus Beatae Mariae of Pseudo–Melito’ (Juniper Carol, O.F.M. ed., Mariology, Vol. l (Milwaukee: Bruce, 1957), p. 149).
Roman Catholic theologian, Ludwig Ott, likewise affirms these facts when he says:
The idea of the bodily assumption of Mary is first expressed in certain transitus–narratives of the fifth and sixth centuries. Even though these are apocryphal they bear witness to the faith of the generation in which they were written despite their legendary clothing. The first Church author to speak of the bodily ascension of Mary, in association with an apocryphal transitus B.M.V., is St. Gregory of Tours’ (Ludwig Ott, Fundamentals of Catholic Dogma (Rockford: Tan, 1974), pp. 209–210).
Juniper Carol explicitly states that the Transitus literature is a complete fabrication which should be rejected by any serious historian:
The account of Pseudo-Melito (a forgery), like the rest of the Transitus literature, is admittedly valueless as history, as an historical report of Mary’s death and corporeal assumption; under that aspect the historian is justified in dismissing it with a critical distaste (Juniper Carol, O.F.M. ed., Mariology, Vol. l (Milwaukee: Bruce, 1957), p. 150).
The history, therefore, of the belief which this festival was instituted to commemorate is as follows: It was first taught in the 3rd or 4th century as part of the Gnostic legend of St. Mary’s death, and it was regarded by the church as a Gnostic and Collyridian fable down to the end of the 5th century. It was brought into the church in the 6th, 7th, and 8th centuries, partly by a series of successful forgeries, partly by the adoption of the Gnostic legend on part of the accredited teachers, writers, and liturgists. And a festival in commemoration of the event, thus came to be believed, was instituted in the East at the beginning of the 7th, in the West at the beginning of the 9th century (A Dictionary of Christian Antiquities, William Smith and Samuel Cheetham, Ed., (Hartford: J.B. Burr, 1880), pp. 1142-1143). http://www.christiantruth.com/articles/assumption.html
From such fraudulent foundations are built the doctrines of the assumption of Mary, her sinlessness, her having just one child. False history, false gospel, false doctrine.