I am aware of Bahai beliefs. So the purpose of this thread is to debate using the Quran if is is abrogated. Surely Allah (swt) can do as he pleases (in ref post 17), but that is not a basis to argue that he has done so. Especially if we find it contrary to verses that clearly state religion has been "perfected" with the coming of Islam.
If you have Quranic evidence to present, share it and I will respond to it.
If you are talking about, whether or not any of laws in Quran, were abrogated by some of the later verses in Quran, then that would be a different topic, than if we are talking about the possibility of another revelation after Quran that would abrogate Quran shariah.
With regards to the first topic, I can remember that some of the Laws in the beginning of Quran were not as restricted as later, so for example, drinking wine was only prohibited if one wanted to say his prayer, but later became more restricted under all conditions. This may be view as an abrogation or gradual modification of that Law.
With regards to second topic, whether it can be deduced from Quran if another revelation is possible or not, I would say, sure, depending how you interpret Quran. As regards to completion or perfection of Islam, this does not necessarily mean no more revelations from God. When looking at the topic of completion in the whole Quran, we see the favor and Book of God was completed and perfected before Quran, and the completion is not limited to only Islam, but also previous revelations.
Please see this site for the verses:
Completion of Religion - what does it mean?
In fact God does not do anything except it is perfect and complete. But this completion or perfection is according to the requirement and exigencies of the time and age. Therefore it was revealed in Quran "to each Age its Book, He abrogates or Confirms what He wills"
Another rational argument is that, the absolute perfection and absolute Truth is only and only restricted to God, therefore in this physical earthly world, the absolute truth and perfection who is God Himself, has never appeared and never shall appear for He is too high, but only a relative truth according to the requirements and capacity of mankind in every Age is revealed. It is like a man who was sick, and the Perfect Physician formulated a perfect Medicine to cure him. In another time same man has a different sickness, and therefore the Perfect Physician formulates a new perfect medicine to cure him. Likewise God from His own Perfect wisdom formulates a new set of teachings and Laws according to the problems and social diseases of the body of mankind in every Age. As mankind in every age has different problems to be solved, therefore a new Law is required in every Age, so for example, at the time of Muhammad, some Arabs buried their daughters alive, so He revealed a Law for that. In Jesus time, too many Jews were divorcing wives, and Jesus revealed a new Law of divorce which was more restricted than before. The disease of our Age to be cured is disunity, therefore Baha'u'llah revealed Laws and teachings to cure this sickness, and 1000 years later also when another revelation comes, it deals with the problems of its own Age.
