The holy book of Islam was dictated by the actual prophet, who was a traditional OT prophet and thus realistic as a continuation of the God Yahweh's divine plan. The prophet controlled the Quran's creation and lived to see his religion set itself on its proper path.
Jesus, in the early Church, has similar claims to be a continuation in the scheming of the Great Y, however, in the current and most dominant Christian Schema, Jesus was not consistent with the One Mad God's previous methods, nor does he write any part of the Bible.
And to really slam the Son of the Sun, not even everything attributed to the ministry of Jesus is included in the Bible, and much of Jesus' story was intentionally cut by entrenched powers who took it upon themselves to judge what was divine gospel, and what might make the proles harder to dominate. The cherry, of course, is that the words of Jesus' own brother and many of those who likely actually knew him, were disavowed by the most powerful, secularly corrupt Christian sect hundreds of years after his death.
The same sect that slaughtered the temporally weaker and frankly more spiritual other sects (which happened to be more jewish and closer to Jerusalem as well as more likely to have been founded by those who actually followed Jesus the man), and then continued to slaughter or buy out any group that ever rose and began to ask, why don't we act more like Jesus told us to. The Cathars are a good example of named heretics, but the Franciscans and the Spiritual Movement they founded is a far more telling tale.
Islam is the real deal folks. Mohammed was the 8th and final prophet. Enoch to Mohammed. The holy path.