Christians accept the four gospels as four different perspectives on the gospel. In fact, each is properly titled, “The Gospel According to …” That is, there is one gospel but four perspectives on it. While it is an interesting exercise to compare the gospels with each other, they are best thought of as parallel accounts of the gospel of Jesus Christ.
There are four branches of Christianity, corresponding to the four Gospels. The parallels between each gospel and each branch of Christianity show this. The four branches are the Orthodox, Catholic, Evangelical, and Pentecostal churches. Like the one gospel, there is only one church, but there are four perspectives on the one church.
The gospel of Matthew shows Jesus as the Messianic King. The gospel of Mark shows Jesus as the Suffering Servant. The gospel of Luke-Acts shows Jesus as the Son of Man. The gospel of John shows Jesus as the Son of God. From considerations like this, one can see the Orthodox, Catholic, Evangelical, and Pentecostal branches, correspond to the gospel according to John, Matthew, Mark, and Luke-Acts, respectively.
Christians have learned to accept the four versions of the one gospel, and their different perspectives. It is past time that Christians learn to accept the four branches of the one church, and their different perspectives.