Hadith and Sunna is a big test
Every prophets, messengers and their companions had to face huge test. It is not the rule of Allah to allow someone in paradise without testing. So what ways those prophets, messengers and their companions had to face the severe test? Mainly it was due to new idea and new religion over existing and prevailing religion in their respective communities. They had to preach something else and almost totally opposite to what was religious idea prevailing in their societies. That is why they had to encounter severe hostility from their respective communities. Allah almighty in the holy Quran reminds us everybody in this regard.
[The Quran 2:214]Do you expect to enter Paradise without being tested like those before you? They were tested with hardship and adversity, and were shaken up, until the messenger and those who believed with him said, "Where is God"s victory?" God"s victory is near.
[The Quran 3:142] Do you expect to enter Paradise without GOD distinguishing those among you who strive, and without distinguishing those who are steadfast?
As long as you are following existing idea or religion in your society there is almost no test. You could get even very cheap popularity and enjoy a nice life! That is why Allah allows devil to fabricate lies and distorted true religion after dying of every prophets and messengers. So that next messengers had to come and face the test again with his handful companions.
[The Quran 6:112] We have permitted the enemies of every prophet - human and jinn devils - to inspire in each other fancy words, in order to deceive. Had your Lord willed, they would not have done it. You shall disregard them and their fabrications.
[The Quran 6:113] This is to let the minds of those who do not believe in the Hereafter listen to such fabrications, and accept them, and thus expose their real convictions.
Interesting enough that after saying above two verses Allah again reminds us in just next verse that the holy Quran is enough and fully detailed. So, no more explanatory book is necessary.
[The Quran 6:114] Shall I seek other than GOD as a source of law, when He has revealed to you this book fully detailed? Those who received the scripture recognize that it has been revealed from your Lord, truthfully. You shall not harbor any doubt.
Allah would like to see that how much we are obedient to Him. That is the most important and crucial. That is why Allah purposely changed the Qiblah for prophet Muhammad and his genuine companions to see that whether they would obey Allah or not. Allah even says that it was not an easy test. It was indeed a difficult test for prophet Muhammadís companions.
[2:143] We thus made you an impartial community, that you may serve as witnesses among the people, and the messenger serves as a witness among you. We changed the direction of your original Qiblah only to distinguish those among you who readily follow the messenger from those who would turn back on their heels. It was a difficult test, but not for those who are guided by GOD. GOD never puts your worship to waste. GOD is Compassionate towards the people, Most Merciful.
Despite Allah says in so many verses clearly that the holy Quran is clear, complete and fully detailed book, Hadith followers can not see that. Because they want to follow what they know from their forefathers. Their forefathers and religious leaders told them Quran, hadith. Isma and Kias are the sources of religious guidance. Therefore, to understand the Quran one must understand the hadiths first! In this way they are simply very busy with reading and analyzing big big volumes of hadiths and disregarding the holy Quran. They are not realizing that hadith and other books in their so called Islam were created by devil and his companions for their testing. So that they can be diverted from the message of the holy Quran to lead toward hell. Is not devil himself is the main test for human?
So those so called Muslims are following Quran hadith, Isma and Kias which they received by born just like Christian, Jew or polytheist also received their respective books and religious guidance by born.
[The Quran 5:104] When they are told, "Come to what GOD has revealed, and to the messenger," they say, "What we found our parents doing is sufficient for us." What if their parents knew nothing, and were not guided?
[The Quran 14:10] Their messengers said, "Do you have doubts about GOD; the Initiator of the heavens and the earth? He invites you only to forgive your sins, and to give you another chance to redeem yourselves." They said, "You are no more than humans like us, who want to repel us from the way our parents used to worship. Show us some profound authority."
[The Quran 21:53] They said, "We found our parents worshipping them."
Neither most of those so-called Muslims nor Christians, Jews or polytheists etc. are verifying their own books and religious doctrines impartially and independently to get true guidance from Allah almighty. One must understand that guidance from Allah (so to get a ticket for paradise) is never a free lunch [The Quran 2:214]. One must work hard and do a lot of brainstorming work (like for example, prophet Ibrahim) and Allah always sees his/her efforts every second so when he/she deserves true guidance Allah allows true guidance for him/her.