Not at all.
First of all, Christianity (as you know) arose out of Judaism. How Christians came to understand Jesus as God derives directly from Jewish tradition. Christianity really arose out of unique circumstances in a unique time in Jewish history. When Jesus was preaching, you had a bunch of Wisdom and Apocalyptic traditions up in the air, and the early Christians certainly took advantage of these ideas.
From the start, Jesus was identified as the earthly manifestation of divine Wisdom, as we see in the writings of Paul as well as in the Synoptic Gospels. Wisdom was seen as having been with God from eternity (Proverbs 8), and as a perfect emanation of God himself (Wisdom 7), having been given complete power by God (Wisdom 7). Jesus was a Wisdom teacher, and he was thought to be a sort of earthly incarnation of Wisdom. In Hellenistic Judaism, Wisdom was known as the “λόγος” (the Word), which the Gospel of John employs having been written by a group of Jewish Christians in diaspora.
The belief about his resurrection fueled things even more, because in the resurrection, whatever was thought of Jesus before was now significantly heightened. In his resurrection, he came to be seen as the risen Lord of the world, seated at the right hand of God, having been given the same glory as God. In the earliest writings, Jesus was seen as Son of God because of his resurrection, and by the Gospel of John he was seen as the Son of God even before his incarnation. In Philippians 2:6-11, Paul quotes and early creed which is thought to have been composed many years before. In it, Jesus is envisioned as divine Wisdom, being equal to God, and becoming incarnate as a man who subsequently is rejected by his nation and raised to glory as Lord of the whole universe. For early Christians, Jesus was given his exalted status to the right hand of God in his resurrection.
Jesus also seems to have made some pretty significant claims about his own self. First, he identified himself as the “Son of Man”, a concept which was already established in Second Temple Judaism (see 1 Enoch and the Book of Daniel). Jesus certainly saw himself as the final prophet, the one who was going to establish God’s Kingdom on earth, the one who was going to be king and judge everyone by their acceptance or non-acceptance of the Kingdom of God.
Now, to make some further remarks on the title “Son of God.” It was meant in two ways:
- The first was clearly Messianic, and heavily influenced by Psalms 2 and 110
- The second was Jesus’s own claims. Jesus did claim to be the Son of God, there is little doubt about this. It’s attested to in all our traditions, and Christians would have hardly kept the Aramaic phrase “Abba” (which is what Jesus referred to God by) if he hadn’t claimed some kind of filial relationship to God.
The idea of Jesus being equal to God is derived from Judaism, certainly a unique time and place in Judaism, but it really was a culmination of Wisdom traditions being connected to Jesus, the ultimate conviction of resurrection which heightened his status, and some of his own claims about himself. I can refer you to some books that go in deeper to this if you need.