This scripture was set as valid before Islam ever came to be. The only ones who disputed it at the time was the jews. At that time, the area where Islam first arose was dedicated to the worship of many Gods, none of them the one true God. And it was a lawless area where people would bury daughters in the sands while alive because they thought them next to worthless. How is it you think there is any Islamic scholars of the time who would record different.
My thoughts are that some of your views of Jesus come from the jews who hated him. I would even speculate that it was the arab king who preceded the rise of Islam. His name was Yusuf As'ar Yath'ar who ruled there in AD525. He was the last jewish king to rule in that area. He murdered a christian bishop and his whole flock by locking them in a church and burning them alive. A woman who was so disgusted with his treatment of the Christians, that she tore off her headscarf to better reproach the king. His response to her was to kill her daughter and granddaughter, and pour their blood down her throat before beheading her. When those in the christian kingdom of Ethiopia heard of this, they hunted down and killed him. Then Islam rose from that area shortly afterword, so you can see the influence the rise of Islam had toward Christianity.
Anyways, even the jews dont believe many of the things that Islam does of Christ. So your beliefs are based on something that was written 200 years after Mohammad died (when it was written, it was based on what people said at the time, no fellow that knew him well was even alive when he wrote the Kuran). And the hadiths took hundreds of years after that to make it look more in depth. Christianity had written tesitmony only a few years after Christs death, by people who KNEW Him personally.