Importance of Aqeedah
Any person who adheres to Islam wants to be on the correct Aqeedah. Unfortunately, this is not the reality, especially at a time when the sects are many.
The aim is to refer back to how the pious predecessors in Islam understood it. How did they understand the subject of Emaan? How did they deal with it?
Allah warns in the Quran of division in religion. It is a bad thing to adhere to any other creed than what is correct.
And hold fast to the rope of Allah (Quran & Sunnah) all of you, and let there be no division among you.
Surah Aali-'Imraan vers 103
The Prophet (ﷺ) said:
"Benu Israel split into 72 sects, and my Ummah will split into 73 sects. They are all in the fire except one." He (Abdullah bin 'Amr) asked: "And who is that O Messenger of Allah?" He (ﷺ) said: "Whoever follows me and my companions."
Jami` at-Tirmidhi 2641
Tirmidhi graded it as Hasan.
There are many groups that ascribe to the correct understanding of Aqeedah. Groups like the Asha'ira, Murji'ah, Khawarij and more. The objective of a Muslim is to move away from all those groups, and to stick to the understanding of the Prophet and his companions. That understanding has been related through books and statements of the Pious Predecessors (Salaf Saliheen).