You have accused that there were other contradicting versions of the Qur'an. Please give evidence.
Surely you know your own history better than I do. All I recall without going back to look stuff up is that the Qur'an was compiled at a later date, after the death of the prophet. At that time one of those who knew the prophet had all of the existing copies of the Qur'an brought together and they were read. That that were judged to be in err were desstoryed. Now, if they were truly known to be in err that makes sense. But that means one is placing confidence not in the Prophet, but in one of the Prophet's companions and his ability to perfectly know what it was that had been revealed to the Prophet. That's called faith. I don't blame you for having faith. Unlike Tango, I don't even consider picking a faith and hoping its right to be an unintelligent route. But that they had to destory some for being wrong, means that just as there are variant readings of the original copies of the writings of the Bible, so also there were variant readings of the Qur'an at some point in the history of Islam. Islam destroyed its variants -- I'll not question the motives, I'll assume for perfectly good reason -- but it did have variants, just like there are variant readings of the Bible which we chose not to destroy. (Though in some Christian communities that happened as well.)
Meanwhile most sources of the NT is Paul who didnt even meet Jesus a.s., most of bible authors are unknown.
nice comparison, eh?
I'm not sure that all of the hadiths are witnessed to by people who were companions of the prophets. No doubt most of those that are most strongly attested are, but I believe there are others that have less support and for which the attestation is a longer chain with someone reporting that some said that some said that a companion of the prophet heard ________________. I don't call that a contemporaneous source. And even those who cite the dependability of hadiths give less credence to some than to others for exactly such reasons.
As to the sources of the N.T., you don't have your facts straight. Most of the sources of the NT is not Paul. He may have been the biggest single contributor, but the contributions by other authors totals more than the work of Paul: 13 books by Paul, 14 books by those other than Paul; 87 chapters by Paul, 173 chapters by those other tahn Paul; Neither by number of books, this is so with any other standard I can think of measuring the relative size of the Pauline vs non-Pauline contributions to the New Testament -- for instance on my hard drive the non-Pauline works of the New Testament take up 1.4 MB, while the Pauline works of the New Testament take up only 514 KB.
And as far as who the various authors of the Bible are:
Genesis -- tradition is Moses, most likely he compiled the stories of oral tradition and it was edited by unknown others
Exodus -- tradition is Moses, most likely he recorded the major part and it was edited by unknown others
Leviticus -- tradition is Moses, most likely he recorded the major part and it was edited by unknown others
Numbers -- tradition is Moses, most likely he recorded the major part and it was edited by unknown others
Deuteronomy -- tradition is Moses, most likely he recorded the major part and it was edited by unknown others
Joshua -- unidentified, though Joshua specifically known to have written portions of it according to the testimony of the book itself, Eleazar most likely wrote other parts
Judges -- written and compiled by an unnamed prophet, traditionally authorship assigned to Samuel
Ruth -- unknown
1 Samuel -- unknown, likely authors include: Abiathar, Nathan, Gad, and pupils from Samuel's school of prophets
2 Samuel -- ditto
1 Kings -- unknown Jewish captive in Babylon
2 Kings -- ditto
1 Chronicles -- most likely Ezra
2 Chronicles -- ditto
Ezra -- Ezra
Nehemiah -- Nehemiah (at least mostly, possible editing by redactors who borrowed from Ezra)
Esther -- unknown, some have suggested Ezra or Nehemian, but most likely a Jew living in Persia in the latter half of the 5th century BC
Job -- anonymous, many suggested authors such as Moses, Solomon, a contemporary of Solomon, Isaiah, Jereamiah, Baruch, and even Job himself
Psalms -- 73 of the 150 specfically ascribed to David; 10 to the sons of Korah; 12 to Asaph; 2 to Solomon; 1 to Ethan; 1 to Heman; 1 to Moses; 50 are anonymous though 4 of these are reported in other places in scripture as having been written by David and many others are suspected of having been
Proverbs -- most of this material originated with Solomon; chapters 30 and 31 are assigned to Agur and Lemuel, respectively; chapters 25-29 were written by Solomon but edited by a committee appointed by King Hezekiah some 200 years later
Ecclesiastes -- actually unnamed, but vs. 1:1 identifies the author as "the son of David, king of Jerusalem" several people fit that description traditional authorship is assigned to Solomon (though some commentators think the author was an anonymous impersonator of Solomon)
Song of Solomon -- Solomon
Isaiah -- Isaiah and Isaiah's disciples
Jeremiah -- Jeremiah
Lamentations -- Jeremiah
Ezekiel -- Ezekiel
Daniel -- Daniel (though many liberal "scholars" disagree arguing that the description of the various miracles are fiction and therefore must not be by the prophet)
Hosea -- Hosea
Joel -- Joel
Amos -- Amos
Obadiah -- Obadiah
Jonah -- traditional view is Jonah (again liberal "scholars" dispute any identification of the book's author)
Micah -- Micah
Nahum -- Nahum
Habakkuk -- Habakkuk
Zephaniah -- Zephaniah
Haggai -- Haggai
Zechariah -- Zechariah (a prophet from around 520 BC, and not to be confused with several other Zechariahs mentioned in the Bible)
Malachi -- Malachiah
Matthew -- not specified in the book, the best evidence supports the unanimous traditional assignment of this book to Jesus' disciple Matthew, son of Alphaeus
Mark -- not specificed in the book, the early church Fathers testified that the book was the work of John Mark
Luke -- not specified in the book, the oldest manuscript of the gospel and all the early church fathers attribute it to Luke
John -- not specified in the book, the testimony of John's own disciple is that John said he wrote the book
Acts -- not specified in the book, but it was definitely written by the same person who wrote Luke
Romans -- Paul
1 Corinthians -- Paul
2 Corinthians -- Paul
Galatians -- Paul
Ephesians -- Paul, though his authorship is disputed by some
Philippians -- Paul
Colossians -- Paul, though his authorship is disputed by some
1 Thessalonians -- Paul
2 Thessalonians -- Paul, though his authorship is disputed by some
1 Timothy -- Paul, though his authorship is disputed by some
2 Timothy -- Paul, though his authorship is disputed by some
Titus -- Paul, though his authorship is disputed by some
Philemon -- Paul
Hebrews -- unknown (at one time thought to have been by Paul, but it never had the testimony of all of the church Fathers, indeed some think it might have been written by Clement of Rome)
James -- James (I believe James the half-brother of Jesus, others would claim another James with the second most likely being the Apostle James, brother of John)
1 Peter -- Peter
2 Peter -- internally it claims to be the work of Peter, many scholars think it was written too late to have been written by the real Peter, the earliest recorded doubt of its authenticity was from Origen (c. 185 - 254 AD) who also accepts it in another source
1 John -- John the apostle and author of the Gospel (I'm aware of those who dispute all Johanine literature as authentically John, I just vehemently disagree with them)
2 John -- same author as 1 John
3 John -- same author as 1 John
Jude -- Jude, brother of James (the half-brother of Jesus)
Revelation -- John