This is a tragedy.. The Jews said their father was Ab, not God..
Jesus was claiming to be the eternal Son of God, the promised Christ who came from God. thats why He was crucified and accused of blasphemy.
Mark 14:61-64 "But he held his peace, and answered nothing. Again the high priest asked him, and said unto him, Art thou the Christ, the Son of the Blessed? 62And Jesus said, I am: and ye shall see the Son of man sitting on the right hand of power, and coming in the clouds of heaven. 63Then the high priest rent his clothes, and saith, What need we any further witnesses? 64Ye have heard the blasphemy: what think ye? And they all condemned him to be guilty of death.
its why they hated Him and began plotting to Kill Him
john 5:18 "Therefore the Jews sought the more to kill him, because he not only had broken the sabbath, but said also that God was his Father, making himself equal with God.
Jesus wasnt Just saying im a child of God...He was saying I am the Messiah, the Only begotten Son of God, I came from Heaven, and will return to Heaven after I am raised from the dead.
God refers to isreal as His children often, Jesus claim was to be the One all the scripture foretold would come. the Begotten Son, the Christ. He was crucified for telling them the truth " I am the Christ, the Son of the Living God..the One God sent. ( deuteronomy 18:18-19, john 12:48-50)