Why the Muslim Ummah is divided into sectors

It has been mentioned in the Hadith:

This (my) Ummah will be divided into 73 sects. All of them will go to hell, except one

When the companions of the Prophet صلى الله عليه وآله وسلم heard this, they inquired

Who are they, O Prophet صلى الله عليه وآله وسلم of Allah? 

The Holy Prophet صلى الله عليه وآله وسلم replied:

Those who follow my way and the way of my companions’ In other words, the followers of my Sunnah

In another narration the Prophet  said: هُمُ الْجَمَاعَةُ They are the Congregation

The Jama'at here, refers to the ‘Sawaad-e-Azam’, meaning the huge Jama’at of true Muslims. The Prophet صلى الله عليه وآله وسلم also mentioned that anyone who separates from the righteous group will be deserving of hell. It is for this reason that this group of devoted followers are known as the 'Ahle Sunnat wa Jama'at.

Note: This section is of utmost importance if a person intends to keep his or her Imaan intact in this present day and age.

There are many misguided and corrupt sects that do not exist in India (or anywhere else) in this day and age, so there is no need and no benefit in discussing those who have ceased to exist.

The corrupt beliefs of those who exist in this day and age is being briefly discussed, so that the unsuspecting masses may be protected from their schemes and deceit, for it has been mentioned in the Hadith Shareef:

 اِيَّاكُمْ وَإِيَّاهُمْ لَا يُضِلُّونَكُمْ وَلَا يُفْتِنُونَكُمْ

Stay away from them and keep them away from you, so that they may not cause you to be misguided or plunged into corruption.