Yes, and the major differences are the Sonship, Deity, crucifixion and resurrection of Jesus. And it is these four things where there is the sharpest disagreement. Both religions are steadfast in their doctrines.
and the other is that the oldest known versions of the NT are written in classical Greek, although with the exception of Paul the Apostles most likely spoke Aramaic.
That could very well be, but I don't think we can conclude that these reasons are sufficient to establish grounds of corrupted manuscripts.
That is something that causes me to doubt the NT. What were the original Aramaic words and why were they not preserved?
Since the originals are long gone, it is impossible to compare what we have today along side them. I have to believe that if they could ever be compared, we would see that there really are no consequential differences. But as noted before, we do have thousands of NT manuscripts which are all in agreement and from which the canon was formed.
True, but why were the Romans and Greeks the final arbiters?
Christians believe that God involves himself in the affairs of men. I assume muslims also believe that. Being involved, we believe that God was able to influence certain men to record and others assemble into we call the Bible. I don't think "who" the final arbiters were is what's important, rather "what" they recorded and assembled under the inspiration of God. Paul and Peter address this in the following verses:
2 TIM. 3:16
All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness,
2 PETER 1:20,21
Above all, you must understand that no prophecy of Scripture came about by the prophet's own interpretation. 21 For prophecy never had its origin in the will of man, but men spoke from God as they were carried along by the Holy Spirit.
I realize muslims believe that somewhere along the line some of these men "goofed." Or they believe that other men did not accurately record what the inspired authors recorded. I think we would agree that God does not make mistakes, and he would have made a big mistake if he allowed the men he chose to record scripture inaccurately, and the other men to interpret and transcribe them likewise. Having said that, I realize there are some inconsequential transcription errors that can't be explained. But I don't think such errors influence the major doctrines over which our religions disagree. Are such minor errors to be perceived as legitimate grounds to make all other scriptures suspect? I don't think so.
Here we will probably differ over what is considered as inconsistencies and contradictions. What I see as consistencies you may see as simply variations in translation. A very hard area for either of us to validate to the others satisfaction.
With such, I cannot disagree. I am still interested, if you are inclined, to continue with this matter of Allah allegedly changing the appearance of a man to look like Jesus on the cross. If it makes sense that Allah did this and knew that sincere men would spread a false message, then would it be unreasonable to question why Allah would allow that to happen?
In an attempt to prompt muslims to consider that Jesus really was crucified, I think it's important to consider all angles in this matter. Like I said before, faith moves mountains and God only has to say something once for it to be truth. From muslim's perspective, the entire matter of the crucifixion of Jesus hangs on one verse in the Quran where there are scores of verses that affirm it in the NT. This is buttressed by key prophecies in the OT which point to the cross. Then there are the statements of secular historians and the Jewish Talmud. Finally, history records many martyrs who were willing to die for what they believed to be true. Nobody was more familiar with what happened than the Apostles who recorded it and gave their lives for it. I think when you put all these things together, they build an air tight case for the crucifixion of Jesus. So the big question is, does the single statement in the Quran disqualify all this? Can there be "two" inspired accounts of what happened? It would be hard to say so.
Peace