The different versions of bible are not “tafsirs” but versions of events of life of Jesus according to different authors, who do not even agree on geneology of their supposed God. There were hundreds of versions of bible of which a handful were canonized.
There are no historical records of Jesus available, unless you consider bible as a historical record, which would be laughable, as its nothign more than mythology. So you cannot say that Jesus received or did not receive a book.
Ofcourse Jesus was a completely different character than Muhammad pbuh, because his circumstances were different. He had 12 followers, who could hardly dare to assert themselves. However, what christians think Jesus would havebeen had he had military might is evident from what they describe he will do when he comes second time, which is, he will exterminate majority of mankind from face of earth unless you happen to be an israelite.
There are no contradictions in Quran, and i know you parrot a few verses copy pasted from anti-islam websites who have o idea of the meaning.
Quran has been unaltered and that is something all the sane scholars of history also attest to.