What is the ruling on the person who denies the comprehensiveness of Islam?

All perfect praise be to Allaah, The Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.

Belief in the comprehensiveness of Islam, its validity for every time and place, and its fulfillment of every worldly and religious requirement is a religious obligation. Anyone who believes otherwise, claiming that Islam is not valid for every time and place, or that there is a better way of life than it, is an apostate. Such false beliefs indicate denial of the revealed texts that assert the perfection of religion and the way it gratifies human needs in the religious as well as the worldly domains.

Such false beliefs also indicate that the person degrades this religion and degrades the Messenger of Allaah, sallallaahu ‘alayhi wa sallam, who conveyed it. They definitely render the person who follows this belief an apostate. All these facts are indisputably established in Islam. Accordingly, anyone who denies the comprehensiveness of Islam in the aforementioned sense is an apostate.