You also need to read scripture.
His father was the Holy Spirit so how did he lose the Spirit if he was sinless? He didn't. Luke 2:40 the “Child grew and became strong in spirit, filled with wisdom; and the grace of God was upon Him.”
What version are you quoting? This is not saying what you think it's saying. None of the translations I looked up render the verse this way. Perhaps you need to change to a more reliable translation in order to "read scripture"? Even the Catholic Bible does not translate the verse that way.
Luke 2:40..."And the child grew, and waxed strong, full of wisdom; and the grace of God was in him." (Douay-Rheims)
Luke 2:40..."And the child grew and became strong, filled with wisdom. And the favor of God was upon him." (ESV)
He was a perfect human whose wisdom for his age was a reflection of that. Unlike sinful ones, he had full capacity in his intellect, emotions and physical abilities. He also had the loving protection of his Father watching over him.
Jesus had no need for baptism. He was sinless. He does need to be confirmed as a Jewish teacher with authority/rabbi/master for the Jews to listen to him and you have to be 30 years old for that. He's operating under the Old Covenant so he follows the rules: he needs to be 30 years old to preach. He needs to be confirmed/ordained as a teacher with authority/rabbi. John is a teacher with authority. He, along with the Father and the Holy Spirit confirm Jesus as a Jewish teacher with authority/rabbi. "Listen to him."
You are correct, Jesus' baptism was not necessary for repentance towards breaches of the law, which is why John at first refused to baptize him. Jesus' baptism was setting a pattern for those who would follow him. Baptism was not a common Jewish practice; there is no mention of it before John's ministry. He was the one "preparing the way" for Jews to become disciples of Jesus. John's Baptism was a symbol of repentance, done publicly for all to witness. In Jesus' case it was a fitting symbol of a death and resurrection....literally dying to a former course and being raised to a new one, with dedication to the doing of God's will first in one's life. Jesus mentions the doing of God's will often in his ministry. All Christians must therefore undergo such a baptism. It is not performed as a washing away of sin because Jesus' blood is what cleanses us from sin (John 1:7)....baptism is the beginning of a new life of service to God. This is the baptism that all JW's submit to. It is a public vow of service to God first in one's life. We then become part of Jehovah's global family, fully equipped for the task at hand. (Matt 28:19, 20)
Does the GB follow the system Jesus used? No, they do not.
Yes they do. We do not baptize infants as if they can somehow make a solemn vow to God before they can choose to do so. Without a dedication from the heart, that kind of baptism is meaningless. No one can dedicate themselves to doing God's will by proxy. For most, it is nothing but a kind of spiritual 'insurance', as if the act itself means anything without a dedication from the heart....and the children, more than likely, will not grow up to adopt the belief of their parents today anyway. So what did their "baptism" accomplish? It was a meaningless ritual.
They have no authority to preach.
What "authority" was needed to preach? All Christians were commanded to "preach the good news of the kingdom" and it was to take place right up to "the end" of the age, when Jesus would come as judge. (Matt 24:14 2 Thess 1:6-9) If it was only for the apostles, then who is "authorized" now? Only those authorized by your church?
If they were to preach as Jesus instructed, then why do we not see them actively "searching" for the "lost sheep" "in all the inhabited earth" as Jesus said? (Matt 10:11-15) No Catholic has ever approached me with anything even resembling the good news.....in fact they don't even want to talk about the Bible in most cases. They just want to perform their rituals, say their Rosaries and carry on with what they want to do. It requires no thinking on their part. The Catholic people who do think about the Bible are eager to talk about it...these are the ones who study with Jehovah's Witnesses and leave the Catholic Chruch. I know because I have studies with quite a few who are now my spiritual brothers and sisters.
In the first century, Christianity spread through word of mouth.....why do you think Jesus asked his disciples to 'beg the master of the harvest for more workers'? The field was ripe but the workers were few by comparison. (Matt 9:37, 38)
If it is only to be "authorized" ones who do this work.....how could it ever be accomplished? Where is the witness of the churches?