Having pretty much irrefutably resolved, I think — to any open-minded person who accepts the authority of the Word of God — the question of Christ’s Deity in the previous post (hopefully that was helpful, in spite of the length), let us proceed.
Anyone who has spent any time at all in reading the four Gospels will soon notice that the Gospel of John is markedly different from the other three.
So much so that Matthew, Mark and Luke have been grouped together and referred to under the name Synoptics, which basically means “same view.” These Gospels record many of the same parables, miracles, and teachings from the Life of Jesus in a similar style, chronological order, and oftentimes, in almost identical language.
But John’s Gospel is another story. It is quite unique in both style, wording, and content. Scholars believe that it was the last of the Gospels to be written, probably sometime around 90-100 A.D., towards the end of John’s life. It has been surmised that at that time, John was the Pastor of the church at Ephesus, and that since he was so close to their Savior — John 13:23, 20:2, and 21:7,20 all refer to John as “the disciple whom Jesus loved” — the Christians of John’s day were constantly asking him to give his account of the Good News as he remembered it: a spiritual record of the Life of Jesus.
The Early Church Father Irenaeus (died ca. 185 A.D.) states that John wrote his Gospel to specifically refute the Gnostic heretic Cerinthus. Church history tells an interesting story of John, who upon encountering this Cerinthus in a public bath house, cried to his disciples, "Up! Let us leave, lest the building fall down upon us; for Cerinthus the enemy of the truth is among us!”
Quite a strong response to false doctrine, as well as perhaps an example for us in our day!
John does not open his Gospel with a genealogy of the natural life of Jesus the Man, as do Matthew and Luke, nor with action as does Mark, but instead goes back to Eternity past, and describes Jesus as God Himself.
Also, it may be noticed that the wording of the Gospel of John is different. The way he describes things, and the words he uses, are more simple and straightforward. Notice the subdued, almost understated way John begins in chapter one:
“In the beginning”
“was the Word”
“the Word was with God”
“the Word was God”
“in Him was life”
“the life was the light of men”
This is especially apparent from his usage of the Greek language, which is of an extremely simple and basic construction. So much so, in fact, that all beginning students of Greek start out their study of this intricate and complex language in the writings of John, usually in this very Gospel. After that, it’s on to more intermediate Greek such as is found in James, the Gospel of Mark, and the Epistles of Peter. Finally — almost as punishment — one concludes with the baffling perplexities of Paul’s scholarly Greek, very complicated indeed. 
It should be noted that while John does use the most basic constructs of language to communicate his message, the words are nevertheless deeply profound in spite of their simplicity. Jerome (died ca. 420 A.D.), the writer of the Latin Vulgate, remarked that “John indeed excels in the depths of divine mysteries.”
Students of the Bible have also noticed certain distinctive overall themes in the four Gospels.
Matthew has been recognized as being directed to the Jews — it is believed to have originally been penned in Hebrew — and being replete with O.T. citations, is thought to have been written to prove the Messiah- and King-ship of Jesus. Thus, it is perhaps addressed to the religious man.
Mark is thought to be addressed to the Roman world, to the man of action. Mark does not open his Gospel with a genealogy, but instead goes directly into the Ministry of Jesus. Inasmuch as Mark was known to be Peter’s companion (see 1 Peter 5:13 and Colossians 4:10), who also was connected to Rome — the “Babylon” reference in 1 Peter 5:13 is thought to be a reference to Rome — it is thought to have essentially been the Gospel according to Peter, and thus it truly seems to be the “Gospel of Action.” If you look up the words “straightway,” and “immediately” in a concordance, you will find that they occur in Mark more times than any other book.
Luke is the longest of the four Gospels, and as he was probably a Gentile (compare Paul’s distinctions in Colossians 4:7-14), his Gospel has been recognized to have been addressed to the Greek world. His Gospel has more parables than the others, and is thought to have been directed to the thinking man.
John focuses his Gospel on the Deity of Jesus Christ (see 20:31), and selects 8 major Miracles from the Life of Jesus to show this. This book has traditionally been recognized as being addressed to the believer.
Thought: Many people say John is their favorite Gospel, the one they turn to in times of difficulty.
Question: What is your favorite Gospel?
-joebib