[Ali Imran]

I never say that...it is called memorise and recite which you were taught to learn since young..
So every moslem propagate the same thing the same message.. there is no need for critical thinking and opinions.

The memorization started from the very beginning. The Prophet would receive revelation from Gabriel and recite the verses to the companions, who would commit them to memory. 

That process is still ongoing today. That alone is a miracle, if you think about it.