Abdullah,
Don't you see, as long as you start with the idea that Jesus was just a man, you will run into problems, that don't only affect Christianity at it's very core, but affect Judaism and even Islam.
Now, why do I say that? even Islam? Because the Qur'an is meant to support and give full understanding to the books that have gone before, the Torah and the Injil ..and the Psalms.
Now, unless the Jews totally corrupted the Old Testament, and the Christians have totally corrupted the New Testament, at least SOME of both must BE the word of God. He promised His Word would stand forever, and if He is God, to be true to Himself, His Word must be eternal as He Himself is eternal.
If His word is so corrupted that what He says in the Qur'an about you looking to the People of the Book for instruction in the things YOU don't understand, is false. And if this is so, then how can your ALLAH be as Almighty and powerful as the GOD of the Old and New Testament. Why would He in one place speak to us, and then in another abrogate(supercede) it? By His own Word He said "I am not a man I change not".
By your own traditions, the later revelation is the one to be seen as God's word, but do you realise that means that it had to be within the 32 years of the revelations that Muhammad received, the so called corruptions of the Old and New Testament must have taken place.
We have manuscripts that predate Muhammad which prove that this is not the case. When you look at the manuscripts which are completely available to be read, and compare them with the ones after Muhammad, they are the same. No wholesale corruption at all.. which proves that God is as powerful in making sure His word is never changed as He said He would be.
Now, if you accept the Biblical testimony that "In the Beginning was the Word, and the Word was with God, and the Word WAS God," And if you believe that Jesus Christ is the LOGOS of God, the Word of God, God Himself, come in the flesh. .. then, the entire history of this world, the Bible itself from beginning to end, and Jesus Himself then makes perfect sense. All the arguements you present start from the assumption He is just a man.. start with the Assumption He is God and see what a different outcome you come to... it's irrisistable Truth and the Truth will set you free and give you a peace that passes all understanding!!