God was referred to as “Our Father” 13 times in the Old Testament. Jesus frequent use of this title brought a whole new understanding of our relationship with God.
Jesus claimed to be one with the Father as part of a larger argument to note that He had existed from eternity past, lived in perfect oneness with the Father, held the same power as God, and was sent by God the Father’s authority. Unfortunately, He was rejected as divine by the Jewish leaders. Jesus’ claim to have equal power as the Father was not blasphemy. It was the plain truth.
The most important reason that Jesus has to be God is that, if He is not God, His death would not have been sufficient to pay the penalty for the sins of the world (1 John 2:2). A created being, which Jesus would be if He were not God, could not pay the infinite penalty required for sin against an infinite God. Only God could pay such an infinite penalty. Only God could take on the sins of the world (2 Corinthians 5:21), die, and be resurrected, proving His victory over sin and death.