The dating of 4th century seems that it could be a fragment of discussion of the
Nicene Creed committee work. That is someone wondering about the virgin birth
and whether Mary was both mother and wife. The limited amount of text supplied
really allows no context assessment at all. This particular possibility would be
less an indication that some Christians thought Jesus was married and more
pointing out the absurdity of Father, Son, and Holy Ghost as a responsible
understanding just as the tale of baptism by John points out three distinct
beings as well.