The Gospel of Mark does not begin with Christ's birth. Instead, Mark begins with Christ's baptism.
In Mark 1:9-11, we see that Jesus left His hometown of Nazareth and was baptized of John in the Jordan River.
Previously, we touched on the reason for Christ’s baptism: to identify with the message which John had been preaching.
The baptism of Christ is recorded for us in the Gospels of Matthew, Mark, and Luke. While we may quickly read over these accounts, one important truth that is contained in these accounts it that of the Trinity.
God the Father is there at Christ's baptism:
And there came a voice from heaven, saying, Thou art my beloved Son, in whom I am well pleased.
God the Son, Jesus Christ, naturally is there.
God the Holy Ghost is there at Christ's baptism:
And straightway coming up out of the water, he saw the heavens opened, and the Spirit like a dove descending upon him:
What is the Trinity?
There is one only and true God...
Hear, O Israel: The Lord our God is one Lord:
…but in the unity of the Godhead there are three coeternal and coequal Person, the same in substance but distinct in subsistences.
God the Father…is God.
God the Son, Jesus Christ…is God.
God the Holy Ghost…is God.
1 John 5:7
For there are three that bear record in heaven, the Father, the Word [Jesus Christ], and the Holy Ghost: and these three are one.
The reason that this is important is because there are some, such as Muslims and Jehovah Witnesses, who reject the doctrine of the Trinity of God. In so doing, they deny the deity of Jesus Christ. However, to truly journey with Jesus we must believe that He is God. That makes all the difference!