What is a brief overview of the Druze sect, their beliefs, and their ruling in Islam?

The Druze are an esoteric, secretive sect who feign Islam, piety, and asceticism, and claim to be reformers, until they find an opportunity to reveal their true nature. They are attributed to Abu Abdullah Muhammad ibn Ismail al-Darazi, who appeared during the time of the Fatimid ruler in Egypt and called people to deify him, claiming that God had incarnated in Ali (may Allah be pleased with him) and then in the ruler. Among their principles are: the belief in incarnation (hulul), dissimulation (taqiyya), the infallibility of their imams, and the allegorical interpretation (ta'wil) of sacred texts away from their apparent meaning. They denied the attributes of Allah, the Last Day, angels, and messengers, and affirmed the transmigration of souls. They distorted acts of worship, making prayer the knowledge of their secrets, fasting the concealment of their secrets, and Hajj the visitation of their sheikhs. They also permitted obscenities. Sheikh al-Islam Ibn Taymiyyah ruled them to be disbelievers, apostates from Islam, whose slaughtered animals are not permissible to eat, whose women are not permissible to marry, and that they and their scholars must be killed.