Is the Deen of Islam Complete?

It is known by necessity that the Deen of Islam is complete, as Allah, the Exalted, says: (This day, I have perfected your Deen for you, completed My Favor upon you, and have chosen for you Islam as your Deen.) (4:3)

It addresses every issue that concerns man in this life and in the Hereafter, Allah says: (And We have sent down to you the Book (the Qur'an) as an exposition of everything, a guidance, a mercy, and glad tidings for those who have submitted themselves (to Allah as Muslims).) (16:89)

Whatever aspect of Shari'ah that has not been clarified in the first source of Islamic Law, which is the Qur'an, has been clarified in the second source of Islamic Law, which is the Sunnah. The Sunnah includes the Prophet's utterances, actions and approvals provided that it has been narrated to us with a sound chain of narration. Allah says: (And We have also sent down unto you (O Muhammad) the reminder and the advice (the Qur'an) that you may explain clearly to men what is sent down to them, and that they may give thought.) (16:44)

The innovator in Deen would in effect be blaming the Prophet for treachery because he did not convey the Message which he was charged with. He would be indirectly saying: 'Islam is in need of this innovation, which the Prophet was aloof of, therefore, I will complete the Deen with this innovation!'

The Prophet said: 'I have left you on a clear path, its night is like its day, and no one would stray from it except a person who would be destructed.' (Hakim)

The ruling of adding something to the Deen which is not legalized by Allah or the Prophet

Allah, the Exalted, says: (Yes, but whoever submits himself to Allah and he is a Muhsin (good-doer) then his reward is with his Rubb (Allah) on such shall be no fear, nor shall they grieve.) (2:112)

What is Bid'ah?

In order to understand the meaning of Bid'ah, we must know what Sunnah implies. Imam Ibn Rajab, may Allah have mercy on him, said: 'Sunnah is a followed path; it includes what the Prophet and his rightly-guided Caliphs adhered to from creedal beliefs, observance of practices, and sayings…this is the complete Sunnah.'

Religious Innovations

Religious Innovations can be categorized into three categories: a. Bid'ah which is tantamount to disbelief, which would take one out of the folds of Islam; such Bid'ah pertains to creedal issues, such as one who offers sacrificial animals to other than Allah, and one who circumambulates a grave, and one who beseeches and seeks help of other than Allah in matters that they ...