God didn't come directly but came through a woman because that is the promise he gave when Adam fell into sin, that he will come in that form to save humanity. He told the devil....

And I will put enmity between thee and the woman, and between thy seed and HER SEED; HE shall bruise thy head, and thou shalt bruise his heel. Geneis 3:15

women dont carry seeds, only men but God was saying down the line, a specific woman will carry a seed (meaning she will not need a man to get pregnant). This seed she carries is the unique savior who will come-Jesus!!!

the bible is a collection of books, u are wrong to see it was written 100 years after Jesus this is a statement made by many muslims incorrectly. First of all teh Old testatement (37 books) were written BEFORE Jesus and the last book of the NEW testatement written in 60 AD. WHY???? because writers of the new testament were all matryred by that time.

Mohammed comes 600 years after Jesus and 540 years after the disciple and claims they were all lying. OK lets look at Mohammed's life from Muslim sources. starting with a few examples:-

Mohammed view on forgiveness:-

He attacked Meccan caravans that were not attacking him, literally killing innocent drivers because of their city’s previous rejection of him.
The brutal execution of 800 Jews at Qurayza who had killed no one, but belonged to a tribe whose leader was pressed to switch loyalties in a time of conflict.
The killing of Uqba for the crime of mocking him at Mecca.
The executions ordered at Medina of those who had insulted him (here, here and here).
The executions ordered at Mecca of those who had insulted him.

Muhammed getting speacial treatment from following his god's laws:-
Mohammed said marry 4 wives, he married NINE, why does he get special treatment against his God's law and marry 5 more than what the law requires.

Mohammeds suicidal thoughts
Why was Mohammed choked 3 times in the cave by a spirit and wanted to commit suicide after that but with his wife's advice he stopped. All the other prophets never wanted to committed suicide after meeting an angel?

Mohammed dealing with women-

Muhammad directly ordered the death of several women in his time. After he captured Mecca in 630, for example, he demanded that two female slaves be put to death along with their master, merely because they had mocked Muhammad in song (Ibn Ishaq/Hisham 819, Abu Dawud 2678).The brutal death of Umm Qirfa also refutes this myth. So do the women who were killed in battle (Bukhari 52:257), when Muhammad’s men attacked a town or tribe – although his preference was that women be captured for sexual servitude rather than killed.

Muhammed dealing with children-

[Muhammad said] “Fight everyone in the way of Allah and kill those who disbelieve in Allah. Do not be deceitful with the spoils; do not be treacherous, nor mutilate nor kill children.” (Ibn Ishaq/Hisham 992)
But Muhammad’s definition of a child was not the same as our modern understanding. Following the surrender of the Qurayza stronghold, he ordered the execution of every male child who had reached puberty. His men had the boys drop their pants so that they could chop the head off of anyone with pubic hair (Sahih Muslim 4390).

Mohammed and his men dealing with the elderly-

She was a very old woman, wife of Malik. Her daughter [and another] were also taken. Zayd ordered Qays to kill Umm Qirfa and he killed her cruelly by putting a rope between her legs and to two camels and driving them until they rent her in two). (Ibn Ishaq/Hisham 980)

I drove them along until I brought them to Abu Bakr who bestowed that girl upon me as a prize. So we arrived in Medina. I had not yet disrobed her when the Messenger of Allah (may peace be upon him) met me in the street and said: “Give me that girl.” (Sahih Muslim 4345)
After having been “killed cruelly” the old woman was spared the sight of her daughter passed between lustful men, which included the prophet of Islam himself