The Gospel of John presents a special challenge to this series because the gospel claims to give us a trustworthy account of who Jesus was, and yet, critical scholars know that John is not as historically accurate as the other gospels. John’s picture of Jesus—both of what he said and did— differs profoundly from that in Matthew, Mark, and Luke. These other gospels are earlier than John and fit much more closely with conditions in Palestine when Jesus lived. Nevertheless, the Gospel of John explicitly asserts both that its principal author knew Jesus personally and that what he wrote is true.
Sinclair, Scott Gambrill, "The Past from God's Perspective : A Commentary on John's Gospel" (2004). Religion and Philosophy Faculty Scholarship. 1.