Hello, Faith:
This may help along in what you are trying to explain. Ordinarily, I would not participate, but I am addressing this very issue on another board, with similar response.
I hope I am helping in some way with information westerners usually do not find readily available, or know that it exists.
This is only the beginning of the information found in the link. There are other sources on the net addressing this issue. For those interested, google abrogations/contradictions/inconsistencies in koran.
BIBLE STUDY MANUALS: QURAN (KORAN): MANUSCRIPT EVIDENCE
H: The Abrogation of Qur'anic Verses
The abrogation of Qur'anic verses presents a problem for Muslims today. As we all know, a man can make mistakes and correct them, but this is not the case with God. God has infinite wisdom and cannot contradict himself. Abrogation flies is the face of sura 6:34 (and 10:65) which state:
"...There is none that can alter the words (and decrees) of Allah." An even more damaging pronouncement is made in sura 4:82 which reads, "Do they not consider the Qur'an? Had it been from other than Allah, they would surely have found therein much discrepancies."
Muslim authorities try to explain the internal contradictions in the Qur'an by stating that certain passages of the Qur'an are annulled (Mansukh) by verses revealed chronologically later than themselves. The verses which replace them are referred to as Nasikh. Yet, there is by no means any certainty as to which disagreeing verses are mansukh and which are nasikh, since the order in which the Qur'an was written down was not done chronologically but according to the length of the suras.
AND:
Jalalu'd-Din estimated the number of abrogations at between 5 to 500. Others say it stands closer to 225. What this shows us is that the science of abrogation is an inexact science indeed, as no-one really knows how many of the verses are to be abrogated. Underlying this claim of abrogation is another concern: How can a divine revelation be improved upon? Would it not have been perfect from the start?
ETC:
Yusuf Ali in his defense of abrogation claims that there is a need for progressive revelation within scripture, saying: "its form may differ according to the needs and exigencies of the time". Christians believe in progressive revelation as well, as God reveals and changes His will for a people as they change culturally over a period of generations. The problem with suras 2:106, 17:86 and 16:101 is that they do not refer to revelations given prior to Muhammad, but refer uniquely to the Qur'anic verses themselves. One cannot claim progressive revelation within a space of only 20 years (this was the time in which the Qur'an was written). The period found in the previous scriptures spans 1,500 years! People and cultures change in that amount of time. Thus the revelations would reflect those changes. To demand the same for a revelation of a mere 20 years suggests that God is not all-knowing. The only other option can be that the recorder made corrections, and then came up with a revelation to authenticate those corrections. While you decide, let's look at some of these abrogations. Some examples of these abrogations are:
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