No they represent the first stage, arguably the only stage in the compilation of Christian scripture. The Tanakh remains firmly Jewish scripture, notwithstanding the bible authors mined it.
Each Gospel text there may be present material from three different periods in early church history.
Stage 1: The Ministry of Jesus
Traditions that date from Jesus' words and deeds during his ministry in the late 20s and early 30s of the first century.
Stage 2: The Post-Resurrectional Preaching of the Apostles
Ideas about Jesus that arose after the Resurrection, especially consideration about his divine identity, expressed through the exalted use of earlier terms such as "Lord" and "Son of God".
Stage 3: The Writing of the Gospels by the Evangelists
The narratives about Jesus that are shaped by the situations, concerns and insights of the Gospel writers themselves.
The four canonical Gospels incorporate traditions dating from Jesus' ministry, which are understood through the experience of the Crucified One as Raised to transcendent life, and that are narrated according to the specific concerns, needs, interests, and insights of their respective authors.
The Gospels achieved their final form only decades after the life and death of Jesus, resulting in four distinctive accounts.
The evangelists did not write the Gospels to give us "histories," as we understand the term. They
experienced Jesus as Raised; that was all they needed.
To ask historical questions of the Gospels is to ask something they were not really meant to provide. Asking, "what is the meaning of Jesus?" or "why is Jesus important?" are appropriate questions. However, since modern readers have a consciousness that history shapes our perceptions and expressions, and since Westerners in particular tend to collapse truth to what is empirically verifiable, we will inevitably ask historical questions of the Gospels. However, we should bear in mind that the biblical authors do not share our mental categories and horizons.
Of course, it is your choice to understand the Gospels as a fundamentalist or literalist. But even for those who would simply throw them out, at least do so for the right reason.