Why was Jesus pbuh Baptized by John

Jesus was adopted into a cursed lineage; he was baptized to remove the sins. Christiansbelieve the exact opposite of the

New Testament.
The baptism itself was the first
awkward fact. Ordinarily, John's
baptism stood as a sign that one had repented of sin: "A baptism in token of repentance, for the forgiveness of sins" (Mark 1:4). It appears not to have troubled Mark that he presented Jesus as a repentant sinner: people "flocked" to John, "and were baptized by him in the River Jordan, confessing their sins…It happened at this time that Jesus came from Nazareth in Galilee and was baptized in the Jordan by John" (Mark 1:5, 9). We have three
choices in interpreting this: Either Mark did not realize what he was saying (the least likely), or he had not developed or he had not developed a theology of Jesus' sinlessness. (Randal Helms, Gospel Fictions, p. 30)
All things considered, then, Mark does not begin his story of Jesus very satisfactorily. Indeed, within two or three decades of Mark's completion, there were at least two, and perhaps
three, different writers (or Christian groups) who felt the need to produce an expanded and corrected version. Viewed from their perspective, the Gospel of Mark has some major shortcomings: It contains no birth narrative; it implies that Jesus, a repentant sinner, became the Son of God only at his baptism; it recounts no resurrection appearances; and it ends with the very unsatisfactory notion that the women who found the Empty Tomb were too afraid to speak to anyone about it. (ibid, p. 34)
Let us quote the passage:
John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins .  (Mark 1:4)
Then Jesus came from Galilee to the
Jordan to be baptized by John. But John tried to deter him, saying, "I need to be baptized by you, and do you come to me?"  Jesus replied, "Let it be so now; it is proper for us to do this to fulfill all righteousness." Then John consented. (Matthew 3:13-15)
Jesus acknowledged that he descended from a cursed lineage, and therefore needed to be baptized. That is the only explanation to solve the problem. John believed that Jesus was sinless, but he volunteered to be baptized.
God cursed King Jeconiah and his descendants forever.
"As surely as I live," declares the LORD, "even if you, Jehoiachin son of
Jehoiakim king of Judah, were a signet ring on my right hand, I would still pull you off.
This is what the LORD says: "Record this man as if childless, a man who will not prosper in his lifetime, for none of his offspring will prosper, none will sit on the throne of David or rule any more in Judah." (Jeremiah 22:24, 30)
The Gospel of Matthew adopts Jesus into the cursed lineage:
And after the deportation to Babylon:
Jechoniah was the father of Shealtiel, and Shealtiel the father of
Zerubbabel, and Zerubbabel the father of Abiud, and Abiud the father of Eliakim, and Eliakim the father of
Azor, and Azor the father of Zadok, and Zadok the father of Achim, and
Achim the father of Eliud, and Eliud the father of Eleazar, and Eleazar the father of Matthan, and Matthan the father of Jacob, and Jacob the father of Joseph the husband of Mary , of whom Jesus was born, who is called Christ. (Matthew 1:13-16)
According to Psalms 132, the Messiah would sit on David’s throne.
The LORD swore an oath to David, a sure oath that he will not revoke:
"One of your own descendants I will place on your throne- if your sons keep my covenant and the statutes I teach them, then their sons will sit on your throne for ever and ever." (Psalms 132:11-12)
But since Jesus descended from the cursed Jeconiah, he never sat on David’s throne. If only Jesus had descended from a separate line, he could’ve sat on the throne.
Jesus never reigned over the house of Jacob or sat on David’s throne (Lloyd Graham, Deceptions and Myths of the Bible, p. 298)
On the contrary, the Pontius Pilate is sitting on the throne judging Jesus!
Matthew and Luke are over-zealous in making DAVID the King, the prime ancestor of Jesus, because of that false notion that Jesus was to sit on the "THRONE OF HIS FATHER DAVID"
(Acts 2:30) . The Gospels belie this prophecy, for they tell us that instead of Jesus sitting on his father's (David's) throne, it was Pontious Pilate, a Roman Governor, a pagan who sat on that very throne and condemned its rightful (?) heir (Jesus) to death. "Never mind,'' says the evangelist, "if not in his first coming, then in his second coming he will fulfill this prophecy" (Ahmed
Deedat, Is the Bible God’s Word? p. 38)