Islam is a deen= a governing system for humanity. It is neither secularism nor mazhab instead it is anti secularism and anti mazhab.
The quran is foundation of deen of islam or islamic way of life. The detail of this way of life does not and cannot come from the quran. This is why the need for hadith. However even hadith is not sufficient to cover all the needed detail and that is why we need fiqh. Because world constantly and continuously changes therefore the need for qayaas and ijma of the ummah when we need to form laws or need to make changes in the constitution based upon the program, goals and guidelines of the quran.
Problem is not with principles of deen of islam but how they are misinterpreted by ignorant mullaans and their blind followers. Who look at things in religious and secure context rather than in the context of islam being a governing system.
Mullaans have no idea what the exact purpose of the revelation of the quran is. This is why they have no proper context within which to look at the quran, hadith, fiqh etc. This is why the whole ummah is confused.
This is the reason today pakistan is going through constitutional and legislative crisis due to ignorance based arrogance of its people. Our education system, be it from government or madrassas is not leading people towards any worthy clear direction.