Owing to the seemingly similarities of some stories in the Holy Book  and The Holy Quran, some Christian scholars claim that the Holy Quran is copied from the Holy Book though this is impossible for the following reasons:

The Qur'ân is made up of 114 Surahs: only 27 of them were revealed in Madinah while the remaining 87 were revealed in Makkah or some other nearby locations. It is to be reminded that the Jews were in Madinah and the Christians were in Najran and Yemen. There was no seat of Christianity in Mecca, in al-Hijaz nor in Madinah.

...in spite of traditions to the effect that the picture of Jesus was found on one of the pillars of Ka'aba, there is no good evidence of any seats of Christianity in the Hijaz or in the near neighbourhood of Makkah or even of Madina.

The Holy Book hadn't been translated into Arabic yet in the time of the Prophet Muhammad.

The similarities between some stories in the Quran and the Holy Book prove that both were revealed from the same source, the contradictions between the two Holy Books are evidnec that the Holy Book was adulterated by human interpolation while the Holy Quran is right simply because science supports the Holy Quran in the places where it contradicts the Holy Book, examples of this is the story Haman in Easter and Haman in the Holy Quran; the Arch of Noah.

The Holy Book, being written on parchments, was so huge that can be easily seen in the house of the prophet and no word was narrated that Mohammed had any book at home, add to this Mohammed was illiterate and died illiterate.

 Some stories in the Holy Quran are not in the Holy Bible or any historical reference- so, if he used to copy, where did he get these stories from?

 Some Christian scholars claim that some stories in the Holy Quran were taught to Mohammed by some Christians who converted to Islam, it is so ridiculous. How could a Christian or a Jew teach Mohammed some of the biblical stories then believe in him as a prophet and bear all the percepts and duties imposed by Islam and even be ready to bear the severe punishments if he transgressed these limits! Moreover, what is the name of this Christian or Jew person?

  If Mohammed had copied from the Holy Book, he, at least, wouldn't have contradicted the Holy Book in matters regarding the Trinity to avoid cultural confrontation with the Christian who came to him from Yemen to discuss these points. If he had done that he would have gained support from the Christians in Yemen against the pagans in Mecca who fought his call.

 In the Holy Quran, there are stories that are not in the Holy Book, These stories were found later in Codices that had remained unknown to the Christian world till recent decades, It is ironic claim that Mohammed had found these codices and then copied from it; these were written in ancient languages that have toiled the translators, Mohammed was not a translator nor did he have translators specialized in such languages.