Denier of Doctrinal Necessity Between Islam and Disbelief Imamate as a Model

 Is he judged as an infidel like someone who denies a religious necessity or does he remain a Muslim but not a believer?

The research addressed several basic introductions; such as explaining the meaning of the necessary and theoretical in language and terminology and explaining its difference from the religious necessary, then explaining the role of time and its effect on the necessary and theoretical, considering that the necessary and theoretical are two descriptions of the thing regardless of its position in religion. Then the research showed whether the Imamate is a religious or doctrinal necessity. After that, it showed that Imamate is a religious necessity for the first class of Muslims. If there is confusion and lack of clarity for other classes of Muslims, it leads to become theoretical for the public, and this is the case for other Muslim sects other than the Twelver Shiites. 

As for the Twelver Shiite Muslims, the concept of Imamate is a religious doctrinal necessity for them. 

Therefore, the research concluded with several results: 

1. Denying the necessary is not an independent subject of disbelief, but rather, it is a subject composed of it and the continuity of denial, to the denial of the Prophet (peace be upon him).

2. The one who denies the doctrinal necessity is not a non-Muslim, but rather he is not a believer.