Should Islam even have a clergy, let alone one which should be obeyed without question? The Quran is unequivocally clear on this issue: that religious clergy can become lords besides Allah.The following verse of Quran is relevant in this regard:
9.31.They (Jews and Christians) took their rabbis and their monks to be their lords besides Allah (by obeying them in things which they made lawful or unlawful according to their own desires without being ordered by Allah), and (they also took as their Lord) Messiah, son of Maryam (Mary), while they (Jews and Christians) were commanded [in the Taurat (Torah) and the Injeel (Gospel)) to worship none but One Ilah (God - Allah) La ilaha illa Huwa (none has the right to be worshipped but He) . Praise and glory be to Him, (far above is He) from having the partners they associate (with Him)."
Moreover,most of them will distract us from the path of Allah while amassing wealth. The following verse is relevant:
9.34. O you who believe! Verily, there are many of the (Jewish) rabbis and the (Christian) monks who devour the wealth of mankind in falsehood, and hinder (them) from the Way of Allah (i.e. Allah's Religion of Islamic Monotheism). And those who hoard up gold and silver [Al-Kanz: the money, the Zakat of which has not been paid], and spend it not in the Way of Allah, -announce unto them a painful torment.
When the Quran invites us to contemplate it in the following verse, it does not mention that we need a barrage of qualifications in order to do so, nor does it ask us to consult any scholars."
47/24. Do they not then think deeply in the Qur'an, or are their hearts locked up (from understanding it)?
So strictly speaking as ordained by the Holy Quran, there should be no clergy for Muslims.