You question any Muslim today as to how would he define the system or DEEN of Islam. Without any hesitation we are replied that, Islam is a compound of the Holy Quran and Hadith. The indoctrination of this reply is so deep down in our hearts, we do not have the faintest notion of doubt about it when answering, no matter how glaringly self-contradictory the myth may appear to us. The important question is, the myth or story we take so much for granted, the sentence we speak everyday with so much confidence and strong conviction; has it ever been brought to our personal scrutiny and examined by rationale, before being accepted by us? Or do we accept, merely because it has traveled down to us through many, many generations.
If that does not happen to be the case, then let us have the courage to face the culmination of the ancestral paths we have chosen. By rationalizing our belief we are obtaining dual advantage. If the myth or cliché stands the scrutiny of our cognizance, then it shall become more profound and ingrained in our minds and close to our heart beats, otherwise we will know, we relinquished a myth that was nothing else but a rigmarole of someone's fantasy. Even more so, it will open our eyes to the fact that our belief was based on sheer custom. The process of cogent reasoning when accepting any statement is also reaffirmed by the Holy Quran that characterizes Momin / Muslim as: These people are not swayed by emotions and they take every step after a lot of deliberation , so much so that even when the Divine Laws are presented to them, they do not submit to these by ignoring their intellect, wisdom, rationale and reason. Also, they do not respond to them as if they were deaf and blind. They adopt the Divine Laws only after careful consideration / for it is clear that when they do not even act upon the Divine Laws without pondering over them, then how would they do so in other spheres of life -Quran chapter 25 verse 73
Reasoning also coincides with one of the postulates of the Holy Quran, wherein is said: You should not take a stand (regarding anything) where you have no personal knowledge ,Use all means of inquiry and then come to a conclusion. Allah Almighty has given you all the faculties for this purpose. Mind it, the ear and the eye and the heart all of them shall have to answer in regard to the question whether personal inquiry was made about the concerned matter -Quran Chapter 17 verse 36