What are the anthropomorphist (Mujassimah) and similitudinist (Mushabbihah) sects, what is the difference between them, and what is the stance of Ahl al-Sunnah wal-Jama'ah regarding them?

The terms tajseem (anthropomorphism), tashbeeh (resemblance/likening), and tamtheel (representation/analogy) are often used interchangeably, but there is a difference between them. Tajseem is the affirmation of a body for Allah. Tashbeeh is broader, and its proponents, who are people of misguidance, liken the Lord to His creation. Tamtheel is the broadest and the most appropriate term to use because it is mentioned in the Quran: "There is nothing like Him" (laysa kamithlihi shay'). It is not correct to absolutely deny tashbeeh because there is a common ground between any two things. Furthermore, some of the Mu'attilah (those who deny Allah's attributes) refer to those who affirm Allah's attributes as mushabbihah (likeners). The Ahl al-Sunnah have unanimously agreed on declaring those who affirm tamtheel, tajseem, or tashbeeh as disbelievers. The people of innovation falsely attribute tashbeeh and tajseem to the Ahl al-Sunnah. Among the most prominent sects that affirm tajseem and tamtheel are: the Saba'iyyah, the Hishamiyyah (followers of Hisham ibn al-Hakam and Hisham ibn Salim al-Jawaliqi), the Yunusiyyah, the Bayaniyyah, the Mughiriyyah, the Mansuriyyah, and the Khattabiyyah.