Jesus Christ whether as the historical person or the one proclaimed through the centuries by the Church is the same, yesterday, today, forever (Hebrews 13:8). The Gospel is not about Jesus, Jesus is the Gospel.
“Who Jesus really was, what Jesus really thought of himself, and who really were included among Jesus’ closest associates – such titillating questions have in recent years occupied the front covers of national news magazines and prompted television documentaries. This is fascinating since the church looks to the Gospels as authoritative witnesses to the one gospel, who is Jesus Christ, and not to the Jesus reconstructed by even our best historians.“
(Joel B. Green, Seized by Truth, p. 109)