im not going to argue the definition of miracle, but i will just note there may be a natural cause for the big bang in an as of yet undiscovered set of natural laws.
This could apply to any of the other miracles, you know.
Just to note... I only just recently got a Quran, and I am just starting to look at it. As far as I am concerned, Allah is the same God... just according to a different people and their understanding - although showing mercy and God favoring the merciful seems to be quite prevalent, at least in the beginning of the Quran, which is as far as I have read.
There is no reason to think that there have not been prophets or miracles or teachings from God sent to other people as well - but that is between them and God. Just look at the spirit of peace that allowed all those Muslims to stand as a human shield around their Christian neighbors... and after reading the first bit of the Quran, I can understand how there absolutely can be peaceful Muslims.
But I have Christ. And even Muslims respect Him and consider Him a prophet with a miraculous conception and everything; just not as the literal son of God.