Before we delve into how the group Nation of Islam are not of mainstream Islam, a brief history of how the group even formed. The group’s original founder, W. Fard, a Syrian rug merchant of the sort came and found Elijah Poole. Together they founded a organization to help the Blacks. They combined the concept of Black Nationalism, their own ideas as well as Islam to furnish this organization called Nation of Islam. Later when W.D Fard mysteriously disappeared, Elijah Poole(now called himself Elijah Mohammed) became leader of the organization. However upon Mr.PooleD Mohammed and re-formed the Nation of Islam.
So based on those facts, it would be presumably best to call the Nation of Islam, Farrakhanism since its the ideas of Farrakhan that revitalized this non-Islamic group. The following will prove indefinitely that Farrakhanism(Nation Of Islam) is not true Islam and does not convey the teachings of Islam.
In terms of GOD/ALLAH ALONE:
ISLAM: One Unique, never appeared in any physical form; hence, no physical representation is possible.
FARRAKHANISM: ...Allah (God) appeared in the Person of Master W. Fard Muhammad, July 1930; the long awaited Messiah of the Christians and the Mahdi of the Muslims.
PROPHET/MESSENGER
ISLAM: Muhammad (S) is the last Prophet and the last Messenger. No messenger or prophet will come after Muhammad (S).
Muhammad is not the father of any man among you, but he is the messenger of Allah and the Seal of the Prophets; and Allah is ever Aware of all things.(30:40)
In many authentic Hadeeths(saying of the Prophet) the same is stated as well:
The Prophet of God (PBUH) affirmed: "My position in relation to the prophets who came before me can be explained by the following example: A man erected a building and adorned this edifice with great beauty, but he left an empty niche, in the corner where just one brick was missing. People looked around the building and marvelled at its beauty, but wondered why a brick was missing from that niche? I am like unto that one missing brick and I am the last in the line of the Prophets." (Bukhari, Kitab-ul-Manaqib). This Hadith has also been related in Muslim, Tirmizi, and Musnad of Ahmad.
The Prophet of Allah (PBUH) affirmed: "The chain of Messengers and Prophets has come to an end. There shall be no Messenger nor Prophet after me." (Tirmidhi, Kitab-ur-Rouya Babu Zahab-un- Nubuwwa, Musnad Ahmad, Marwiyat-Anas bin Malik)
And not only that but repected scholars of previous generations agree on the meaning of this statement:
Imam Ghazali- "This verse is conclusive of the precept that our Prophet (SAW) is the last and that there shall be no Nabi after him. When there shall be no Nabi to follow him the ordainment of a Rasool cannot arise by logic of anterority because the status of a Rasool is more exclusive then that of a nabi. Every Nabi(prophet) is not a Rasool(messenger) but every Rasool is a Nabi. There exists a continuous and unbroken chain of citations of Ahadith from a large number of venerable Sahabah or Companions of the Prophet (Allah be pleased with them), that there shall be no Nabi or Rasool after Muhammad (SAW)". (Tafseer Ibn-e-Khateer vol. 3 p453)
FARRAKHANISM: Elijah Muhammad was a Messenger of Allah. Are there any more messengers or prophets to come? Not clear in their message.
In other words, a fake prophet which fulfills a prophecy by Muhammed(pbuh):
It is related by Hazrat Thauban (RA) that our Prophet (SAW) said, "In my Ummah there shall be born thirty liars (dajjals) each of them will claim that he is a prophet but I am the last of the Prophets; there shall be no prophet after me".(Abu Dawood and Tirmizi)
THE LAST DAY/THE LIFE HEREAFTER
ISLAM: The life on earth as we know it will come to an end; it will be followed by the life hereafter which includes physical resurrection of the entire humankind, judgement and the life of paradise or hell.
Those who disbelieve say: The Hour will never come unto us. Say: Nay, by my Lord, but it is coming unto you surely. (He is) the Knower of the Unseen. Not an atoms weight, or less than that or greater, escapes Him in the heavens or in the earth, but it is in a clear Record. That He may reward those who believe and do good words. For them is pardon and a rich provision. But those who strive against our revelations, challenging (Us), theirs will be a painful doom of wrath. (34:3-5)
FARRAKHANISM: ...BELIEVE in the resurrection of the dead - not in physical resurrection, but in mental resurrection. No already physically dead person will be in the Hereafter; that is slavery belief, taught to slaves to keep them under control. When you are dead, you are DEAD.
The Quran speaks of people with similar ideas such as followers of Farrakhanism:
They say, There is nothing but our present life; we die, and we live, and nothing but Time destroys us. Of that they have no knowledge; they merely conjecture. And when our revelations are recited to them, their only argument is that they say, Bring us our fathers, if you speak truly. (45:24-25)
THE
QURANISLAM: It was revealed to Prophet Muhammad(pbuh) between 610 and 632 C.E.
It is the last revelation of Allah to mankind since he(pbuh) was the last messenger that was to reveal a holy book to mankind.
The Koran admittedly occupies an important position among the great religious books of the world. Though the youngest of the epoch-making works belonging to this class of literature, it yields to hardly any in the wonderful effect which it has produced on large masses of men. It has created an all but new phase of human thought and a fresh type of character. It first transformed a number of heterogeneous desert tribes of the Arabian peninsula into a nation of heroes, and then proceeded to create the vast politico-religious organizations of the Muhammadan world which are one of the great forces with which Europe and the East have to reckon today. --G. Margoliouth, Introduction to J.M. Rodwells, THE KORAN, New York: Everymans Library, 1977, p. vii.
FARRAKHANISM: Contradictory beliefs. On one side, ...BELIEVE in the Holy Quran and in the scriptures of all the Prophets of God, and on the other side, We, the original nation of the earth ... are the writers of the Bible and Quran. We make such history once every 25,000 years ... it is done by twenty-four of our scientists. Both the present Bible and the Holy Quran must soon give way to the Holy Book...
SHAHADAH
ISLAM: It means what it says, that is, Allah is Unseen, He is the Creator, the Sustainer. Mankind is accountable to Him Alone, and Prophet Muhammad (S) of Arabia is the final and ultimate ROLE MODEL; no one can substitute for him.
I bear witness that there is no god but Allah, he is alone and has no partner and I bear witness that hazrat Muhammad (P.B.H.) is his messenger
That is the Shahadah.
FARRAKHANISM: A cover up to deceive gullible Muslims. Allah (God) appeared in the person of Master W. Fard Muhammad, and Muhammad of Arabia (S) was one of the prophets, not a role model for our times. The real role model and lawgiver for our times is Elijah Muhammad.
SALAH
ISLAM: Five times a day is required; SALAH (prayer) includes QIYAM (standing), RUKU (bowing), SAJDA (prostration), JALSA (sitting on the floor) and recitations.
And who (strictly) guard their prayers. These will be the heirs (warithuna). Who will inherit paradise: they will dwell therein (for ever) (Q. 23:9-11).
Guard strictly your (habit of) prayers, especially the middle prayer; and stand before Allah in devout (frame of mind) (Q. 2:238)
FARRAKHANISM: No five times daily SALAH (prayer); prayer, when done has no RUKU or SAJDA. Friday is a major congregational prayer day, not for SALAH, but to say DUA and to listen to a Minister.
ZAKAH
ISLAM: Required on accumulated wealth after having in possession for one year above the NISAB (certain limits), as defined in SHARIA (Islamic law).
FARRAKHANISM: It is a tax as poor due on income, similar to income tax.
Who benefits?
SAWM
ISLAM: Fasting is required in the month of Ramadan, ninth month of Islamic calendar.
The month of Ramazan is that in which the Quran was revealed, a guidance to men and clear proofs of the guidance and the distinction; therefore whoever of you is present in the month, he shall fast therein, and whoever is sick or upon a journey, then (he shall fast) a (like) number of other days; Allah desires ease for you, and He does not desire for you difficulty, and (He desires) that you should complete the number and that you should exalt the greatness of Allah for His having guided you and that you may give thanks. (2:185)
FARRAKHANISM: Fasting is required in December only. Fasting in the month of Ramadan is optional.
HAJJ
ISLAM: Required once in a lifetime if conditions of finances, health, and safety of travel are met.
In it are clear signs, the standing place of Ibrahim, and whoever enters it shall be secure, and pilgrimage to the House is incumbent upon men for the sake of Allah, (upon) every one who is able to undertake the journey to it; and whoever disbelieves, then surely Allah is Self-sufficient, above any need of the worlds.(3:97)
FARRAKHANISM: No Hajj requirement. Farrakhan and his cronies take trips to Saudi Arabia, and by the way, to Makkah for the main purpose of image building and to raise funds from gullible rich Arabs.
LAWFUL (HALAL); UNLAWFUL (HARAM)
ISLAM: Determined by Allah, the God Alone, announced in the Quran(in 5th Sura mostly) and by the Prophet Muhammad (S), recorded in the authentic Hadith sources.
FARRAKHANISM: Determined by W.D. Fard and announced by Elijah Muhammad. The Quran and Prophet Muhammad (S) have no relevance nor authority with regard to lawful and unlawful.
AUTHENTIC HADITH
ISLAM: An indispensable source of Islamic beliefs and practices, the only source after the Quran. Indispensable for the understanding of the Quran itself.
FARRAKHANISM: Ignored, if not totally rejected by Farrakhanis. However, the leadership, including Farrakhan himself, may invoke Hadith if it suits their purpose to fool gullible Muslims.
Racism
Islam: No racial distinctions, everyone equal and slaves/servants of Allah.
O you men! surely We have created you of a male and a female, and made you tribes and families that you may know each other; surely the most honorable of you with Allah is the one among you most careful (of his duty); surely Allah is Knowing, Aware.(49:13)
Farrakhanism: Belief of Black as master race and belief that being a black person is being God in effect.
So based on all the overwhelming evidence as shown above, the Nation of Islam or rather Farrakhanism is not true Islam and its followers are not Muslim but rather misguided ignorants that need guiding to true Islam.
A portion of this article comes from III&E article: Islam and Farrakhanism. I just added more quotes and more information to it.