The ruling on calling an open sinner a mushrik (one who associates partners with Allah) or a disbeliever

Question:
Is it true that the scholars agreed that an open sinner and one who commits major sins is not called a believer, nor is he said to be a disbeliever, as I saw that in the book of one of the historians?

Answer:
This is the view of the Mu'tazilah. This is the view of the Mu'tazilah. They say that the one who commits a major sin is neither a believer nor a disbeliever, but rather he is in the intermediate position between the two positions. The young man who said this said that he is a Mu'tazili. Perhaps he is a Mu'tazili originally, or perhaps he is ignorant and does not distinguish between the valid and the invalid. This is the affliction of ignorance and the affliction of arrogance, where a person takes knowledge from books and does not refer to the scholars, nor does he learn, nor does he study the creeds correctly. He falls into these matters and considers everything he finds in the books to be correct, taking it as it is. He considers it strong and established. It is not permissible.