9In those days Jesus came from Nazareth of Galilee and was baptized by John in the Jordan. 10 And when he came up out of the water, immediately he saw the heavens opening and the Spirit descending on him like a dove. And a voice came from heaven, “You are my beloved Son; with you I am well pleased.” 
It is possible to have lived in and around Jerusalem in 1st century AD and not have been ware of a little insignificant town called Nazareth in the northern region of Galilee. I realized when writing this that my geographical knowledge of Judea/Galilee is pretty shocking. I found the following map helpful. (It won’t upload my picture but I can send it it you if you like)
. Johns followers seem to have been drawn from the southern region of Judea with many followers coming from Jerusalem(v5). To any 1st century readers who do not know the stories of Jesus it must have seemed like a shock. The coming strong one who takes on the Isaiaic role of YHWH is from the North and from a village which is not mentioned in OT. Yeshua (Jesus) is baptized by John, when he comes up from the water (full immersion) the spirit comes down. The opening of heaven is a familiar theme within the bible, it is part of Jesus own subjective experience.
And he said to him, “Truly, truly, I say to you, you will see heaven opened, and the angels of God ascending and descending on the Son of Man.” 
The usual word for talking of the opening of heaven is ἀνοίγω but Mark chooses to use the word σχίζω. Why? One commentator notes that Mark uses this word again in his mention of the curtain being torn in two. This ‘startlingly different and yet no less important moment of revelation of the Son of God at the other end of his earthly ministry.
Heaven and earth are not miles apart. Sometimes we can think of God and heaven as being up there and that if you travelled far enough you would reach it. Howevr Mark, shares the biblical worldview with heaven and earth existing in different realms. At times these relams overlap, heaven and earth meet. Jesus is described as the son in whom God is well pleased. This draws on the wording of ideas and wording of the prophet Isaiah.
And the Spirit of the Lord shall rest upon him,
the Spirit of wisdom and understanding,
the Spirit of counsel and might,
the Spirit of knowledge and the fear of the Lord. 
Behold my servant, whom I uphold,
my chosen, in whom my soul delights;
The Spirit of the Lord God is upon me,
because the Lord has anointed me
to bring good news to the poor;
Mark Mark dissplays a high Christology in his opening verses
· Jesus is described as ὁ ἰσχυρότερός (stronger/mightier) which is an attribute of YHWH
· Jesus gives the spirit which is an attribute of YHWH
· Jesus is somehow to be seen as Israel when he is described as the son
· Jesus is the servant of Isaiah