In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Imaam Al Laalakee’ee [may Allaah have mercy upon him] said, “The statements (or views) of ahlul bidah do not become manifest except by way of a ruler with absolute authority or by way of an obstinate sinful devil who misguides the people secretly through his bidah, or gives it the upper hand by way of his sword (i.e. oppression, fighting, killing etc) or captures the heart (of a person) by way of His wealth to mislead him from the path of Allaah out of fanaticism for his bidah and in defence of his misguidance, turn the Muslims away from the truth and put them to trial in their religion”. [Sharh Usool Al-Ittiqaad Ahlis Sunnah Wal Jamaa’ah 1/15]

Allaah’s Messenger [peace and blessings of Allaah be upon him] said: “Indeed, the one who lives long amongst you will see a lot of differences, and beware of newly invented matters (in the religion) because it is misguidance. So whoever amongst you reaches that, then upon him hold onto my Sunnah and the Sunnah of the rightly guided khulafaa, and bite onto it with the molar teeth”. [Reported by Ahmad: 4/126; Abu Daawud 4607; Tirmidhee 2676; Ibn Maajah 43]

Imaam Ibn Ibn Rajab [may Allaah have mercy upon him] said: In this hadeeth is a command that when splitting and differing occurs, adhere to the Sunnah of the Messenger and the Sunnah of the khulafaa [Abu Bakr, Umar, Umar and Ali] after him. The Sunnah is a path that should be adhered to and it includes that which the rightly guided khulafaa were upon in creed, deeds and statements. This is the complete Sunnah. [[Jaami-ul Uloom Wal-Hikam: page: 249. Slightly paraphrased]

Deviated Sects: Hafs Bin Humaid [may Allaah have mercy upon him] said, “I said to Abdullaah Ibnul Mubaarak [may Allaah have mercy upon him, ‘How many sects has this Ummah spilt into?’ He said, ‘The foundation of the sects are four: the shia, the harooriyyah (i.e. khawaarij), the qadariyyah and the murji’ah. The shia (further) split into twenty-two sects; the harooriyyah (further) split into twenty-one sects; the qadariyyah (further) split into sixteen sects and the murji’ah (further) split into thirteen sects”. [Al-Ibaanah of Ibn Battah 1/379-380]

Read: All The Sects In The Fire Except One – [A Precise Clarification By Imaam Abdul Azeez In Baaz]: https://salaficentre.com/2021/03/06/all-the-sects-in-the-fire-except-one-a-precise-clarification-by-imaam-abdul-azeez-in-baaz/