I can quote so many verses about this topic, but I will be brief, it's not. If I quote all the verses about this, the points I bring will have so many verses, but rather I will summarize what people who read Quran should recall and be familiar with.
1)Believers were always seen low, vile, per their opponents and Quran says the people of hell will be amazed that there was a group of people they use to count as the most evil and vile, but not one of them in the hell.
2)People know for "righteousness" without proof from God in form of signs and scripture from him designating them specifically as that, for the most part, are the opposite and clothing themselves with garbs of purity and righteousness above others, when they are not even believers.
3) Clergy of all religions known as highly more pious, pure or righteous then others, there are so many verses, about how their reputation was based on falsehood from Iblis and the sorcery gives them the illusion of it in both their eyes and the eyes of the people.
4) The only people who are attributed purity by God and have authority to speak about guidance with firm authority, is those who God manifests their purity per scriptures and proves them, and who have proof of their authority from God without doubt.
5) Who truly fears God is not known through reputation, claiming one fears God, outward show and marks, all this doesn't prove it.
6) God always divided believers from disbelievers, with the word of light from him in both form of scripture and in humans who interpret the scripture and leads humans back to God and calls them back to God.
7) The sorcery itself makes people belittle Prophets as liars, deceivers, greedy people out for their own reward, let alone, believers, and so in a world ruled by dark magic from Iblis, one cannot rely on who is "known" for knowledge, piousness, or purity. One has to seek proof from God.
8) God emphasizes so much places, faith is hidden and needs to be tested, and even when one is sure and certain, and don't doubt after, if they sin and unclean fire takes over their souls, they can turn on their backs... and so even if a person is a believer and you know he is, this is different then guarantee from reverting to disbelief and this is true vice versa, lost souls and rebellious souls still have a chance to repent and thank God and turn to the right path. The nature of most humans is they are volatile. IT's the chosen ones who God knows for sure if they slip, they will repent and turn back, and will remain on the straight path and not leave it no matter what slip they might slip by.
Believers are volatile, and Suratal Auli-Imran shows even the original Badr fighters, were volatile and can turn on their backs after, let alone other believers.
9) Real trials come at moments we don't expect and make us and break us, like Iblis when ordered to prostrate to Adam. Worshipping God for eons before, he didn't expect himself to leave the path, disbelieve in God and rebel against the order of the heavens and the earth, but here is and here we are.
10) The Quran talks about disbelievers having followed their leaders and their great ones, their great ones were not great, only their eyes, this means, reputation in people's eyes is not reliable.