Is a person who criticizes the Islamic religion and the interpretations of the predecessors, reinterprets verses, and doubts well-known rulings such as the hijab and the prohibition of alcohol, while maintaining prayer and fasting, considered a Muslim, and how should he be dealt with?

The wise and firm Shari'a must be applied in all times and places because it is a complete religion, and the affairs of people can only be set aright by it. Whoever denies a matter known to be an essential part of the religion, such as the prohibition of intoxicants (khamr) and the obligation of hijab, or doubts it, is an apostate who has left the fold of Muslims, even if he prays, fasts, and claims to be a Muslim. This ruling does not apply to a new convert to Islam who is ignorant of some of these rulings. Whoever denies the prohibition of adultery (zina) or other unanimously agreed-upon prohibitions, or denies the obligation of an unanimously agreed-upon act of worship, shall be informed of the ruling. If he insists and is not ignorant of such matters (i.e., his background suggests he should know), he has committed an act of disbelief (kufr). Whoever insists on denying a matter known to be an essential part of the religion after receiving advice and clarification is treated as an apostate in terms of his rulings.