: Of all the so-called Gnostic Gospels the one that fascinates me most is the Gospel of Thomas. . . . What is interesting is that it is dated to as early as 60AD, or the same time the canonical gospels were written.
Well, by SOME people, at least. Wikipedia
quotes two scholars who say:
Assigning a date to the Gospel of Thomas is very complex because it is difficult to know precisely to what a date is being assigned. Scholars have proposed a date as early as AD 60 or as late as AD 140, depending upon whether the Gospel of Thomas is identified with the original core of sayings, or with the author's published text, or with the Greek or Coptic texts, or with parallels in other literature. . . .
Most interpreters place its writing in the second century, understanding that many of its oral traditions are much older. . . .
And of course, given that quite a few of the sayings in Thomas also appear in the canonical gospels, no one would dispute that it reflects older traditions on at least SOME level. But as far as when the Gospel of Thomas ITSELF was actually composed ... it seems we're looking probably at the 2nd century, AFTER the canonical gospels were composed, rather than the 1st.
: . . . Thomas had might have used the same source as Matthew and Mark, the so-called Q theory.
Actually, Q theory holds that Matthew and LUKE used Q (in addition to Mark) when forming their own gospels. But it's only a theory, and we don't actually have any hard evidence that the Q source actually existed. If "Q" is simply understood to mean "all the material that Matthew and Luke have in common that cannot be found in Mark", then it could refer to many sources, not just one.