To say or to claim you are a Muslim you have to believe and follow the Qur’an and Sunnah properly. If you differs in belief then you are not a Muslim.
For example, If you believe as the Nation of Islam (Farukanism) believe
…One God (Allah) and that 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…
then you are a Kaffir ie. Disbeliver because.
Allah swt, says in the Qur`an, in chapter 4, verse 36, “Serve Allah, and join not Any partners with Him; … “. And according to ahadith narrated by Masruq, in Sahih Bukhari, ‘Aisha said, “If anyone tells you that Muhammad has seen his Lord, he is a liar,
for Allah says (in 6:103), ‘No vision can grasp Him.’…”.
The followers of the Nation Of Islam further believe “in the resurrection of the dead–not in physical resurrection–but in mentalresurrection. They also believe that the so-called Negroes are most in need of mental resurrection; therefore, they will beresurrected first.
” But the Qur`an states in chapter 20, verse 55, “From the earth did We Create you, and into it Shall Wereturn you, and from it shall We bring you out once again.”
Even more pointedly, the Qur’an also states in 64:7,
The Unbelievers think that they will not be raised up (for Judgement).
Say: “Yea, by my Lord, Ye shall surely be Raised up: then shall ye Be told (the truth) of All that ye did. And that is easy for Allah.”
If you believe as the Ahmadia/Qadiani believe that another prophet came after Muhammad in Pakistan then you are a Kafir ie. disbeliever because Allah swt said in the Quran.
The Qur’an states (translation): “O people! Muhammad has no sons among ye men, but verily, he is the Messenger of Allah and the last in the line of Prophets. And Allah is aware of everything.” (33:40)
The true Prophet of Islam, Muhammad, observed:
“The tribe of Israel was guided by prophets. When a prophet passed away, another succeeded him. But no prophet will come after me; only caliphs will succeed me.” (Sahih Bukhari)
Therefore the Message is very clear. Islam is what is in the Qur’an and Sunnah. We should be following the Qur’an and Sunnah, Not our selfish desires and man-made ideas about God.
No matter how hard work (worship day and night) you do for God -There will be no benefit on you unless you practice Islam according to the Qur’an and Sunnah.
If anybody believe in something which is not in Islam by heart (when evidence is presented) -Stay away from them, They are the party of Shaitan (Devil).
LA HOWLA WA LA QUATA ILLA BILLA HIL A’LIUL A’ZIM.
[“This day I have perfected your religion for you, completed My favour upon you, and have chosen foryou Islam as your religion (way of life)”. TM. Qur’an5:3]
[“If anyone desires a religion other then Islam (Allah’s way of life), never will it be accepted of him; andin the Hereafter he will be in the ranks of those who have lost all spiritual good”. TM.Qur’an3:86]
Therefore the -Nation of Islam (Farukanism), -Ahmadiya (Kadyanis), Bahai’s, Shiya, (Rafidah -enemies of the true Path), etc.. are not Muslim because their belief is not according to the Qur’an and Sunnah.
If anyone’s belief is not according to the Qur’an and Sunnah they are Kafirun (disbelievers). They will go to HELL in the Hereafter. And their pious desires will not benefit them at all. All their worship will be a waste.