DHUROORIYAAT-e-DEEN refers to all those beliefs and practices, the source of which has been established with absolute certainty to be Rasoolullah (SAW). The certainty of such beliefs and practices is of such an absolute degree that it does not admit the slightest doubt.
Belief in all Dhurooriyaat-e-Deen is Fardh. Such belief is part of Imaan . Denial of any belief or practice among the Dhurooriyaat-e-Deen is kufr, even if it happens to be a Mustahab act, e.g. the Miswaak. The Miswaak is a Sunnat practice of Islaam . Rejection or denial of the Sunniyat (Sunnat nature or state) of the Miswaak is kufr although it is not compulsory to use the Miswaak.
Dhurooriyaat-e-Deen consists of ahkaam (law) of all categories, viz. Fardh, Waajib, Sunnat, Haraam, Mubaah, Mustahab, etc. The following points regarding Dhurooriyaat-e-Deen should be well understood:
56. It is Fardh to believe in every belief and practice constituting the Dhurooriyaat-e-Deen even if such practices are Sunnat, Mustahab, Nafl or Mubaah.
57. Denial of any belief or practice among the Dhurooriyaat-e-Deen is kufr.
58. Neglecting or discarding any Fardh, Waajib or Sunnatul Muakkadah act is not kufr if one believes and accepts the act. But such neglect renders one a faasiq and liable for Allah's Wrath.
59. Omission of a Mustahab.
Dhurooriyaat-e-Deen is a technical term which, thus, covers all beliefs and acts which are for a certainty known to be part of Islaam . This term does not mean that it is Fardh to practise every act described as Dhurooriyat –e-Deen. From this explanation it will be clear that kufr does not imply only rejection or denial of a Fardh injunction as has been understood by some people. Denial even if by way of ta'weel(interpretation) –of any Deeni act which has reached us by way of tawaatur transmission, is kufr which renders the denier a kaafir. Thus, denial of the fact that Athaan an interpretation which differs with the popular understanding of Athaan as it has reached us. This ruling applies to all beliefs and practices which are described as Dhurooriyaat-e-Deen.