As a general rule...

As a general rule, only a few persons are informed of the matter directly, and it is through them that the rest of the people get the information; he who is present conveys the message to the absent persons; the learned one explains it to the ignorant. The knowledgeable man is counted as one of the links to convey the message, like the tongue and speech. When a learned man, bound by the pledge taken from him, explains the message to others, he makes the truth clear to the people.

If he hides his knowledge, he keeps the truth concealed from the people, after it was made clear to them. And, as Allah has said, it is the only thing which has made people differ in matters of religion, and has diverted them from the path of guidance to that of misguidance. Otherwise, religion conforms with nature; human nature agrees with it and discerning mind surrenders to it when it is properly explained.

Allah says: Then set your face uprightly for the (right) religion in natural devotion (to the truth); the nature made by Allah in which He has made men; there is no alteration (by anyone else) in the creation of Allah; that is the right (established) religion, but most people do not know (30:30).

So, the religion is natural; nature can never resist it, if it appears before it with some clarity, either because of the purity of the recipient's heart, as is the case of the prophets, or because it is explained properly - the latter method invariable always depends on the former. That is why the above-quoted verse combines the two premises: the naturalness of religion and lack of its knowledge.

It says: the nature made by Allah in which He has made men ; and then says: but most people do not know. Again Allah says: Mankind was but one people, so Allah sent the prophets as bearers of good news and as warners, and He sent down with them the book with truth, so that it might judge between the people in that in which they had differed. And none differed about it but the very people who were given it, after clear signs had come to them, revolting among themselves... (2:213).

It shows that difference about the contents of the book emanates from the revolt of the scholars who already have its knowledge. Religious differences and deviations from the right path are caused by the revolt of the religious scholars as they conceal the revealed truth, misinterpret it and alter it; and because of their injustice. That is how “injustice” will be defined on the Day of Resurrection.