The Definition of the Necessities of Deen
According to the Shariah, the necessities of the Deen are those matters which are verified as being from Nabi (sallAllaahu alaihi wasallam) through Tawaatur, are generally the Muslims are aware of them. That is these matters of the Shariah are not only confined to the knowledge of the Ulama, but even the normal laymen are aware thereof. Such matters are regarded as the necessities of Deen.
For example that Allaah Ta`ala is One and that He is the Creator and Sustainer of everything. The Qur`aan Shareef and all the other Divine Kitaabs are revealed from Allaah Ta`ala. The truth and veracity of all the Ambiyaa (alaihimus salaam). Jannat and Jahannum are Haqq and that the Nabis (alaihimus salaam) had performed miracles. To accept as fact and regard as Halaal and Haraam those things that are classified as such according to the Shariah. If a person refutes any of these things or even has doubt regarding them, then such a person is not a Muslim, but a kaafir. It is necessary for a Muslim to accept all the necessities and Qat`iyaat of Deen. It is not sufficient for one to be classified as a Mu`min if he accepts one out of 100 things.
A good and loyal citizen is one who accepts all the laws of the government. If a person accepts 99% of the laws of the country and he refutes just one, and he says that this one law does not appeal to him and he gives all sorts of interpretations and excuses for it, and he advises against it, then such a person will not be regarded as a loyal citizen , rather, he will be regarded as a rebel and traitor.
TO OFFER EXCUSES AND INTERPRETATIONS OF THE NECESSITIES OF DEEN AND THE MUTAWAATIR MATTERS IS ALSO KUFR
Just as it is kufr not to accept any necessity and Mutawwatir of Deen, so too is it kufr to offer excuses and incorrect interpretations regarding any one of them. To make conjectures regarding an absolute matter is just like refuting it.
Just as it is kufr to refute Salaat, Roza and Zakaat, so too is it kufr to offer any fallacious interpretation regarding them. It may be tolerable to offer interpretations in matters that are not very clear and are not absolute or Mutawaatir. As for matters that are absolute and Mutawaatir, to offer interpretations for them is tantamount to making fun and jeering at them.