The ruling on the claim that people know tawhid (the oneness of Allah) and therefore do not need to be called to it

Question:
It is spreading now, O Shaykh, in some places, for people to belittle calling people to tawhid (the oneness of Allah). They say, “This is well-known; people know it, so move on to other things, or respond to the philosophers, or respond to such-and-such. As for tawhid (the oneness of Allah), people know it; there is no need for it.”

Answer:
This is a lie. To say that people know it is a lie. Not everyone knows tawhid (the oneness of Allah). Only the people of knowledge, those firmly grounded in knowledge, know it—meaning a precise and correct knowledge. Only the people of knowledge and their followers know tawhid (the oneness of Allah). As for most people, they are ignorant of tawhid (the oneness of Allah). If you asked them, they would not answer you about tawhid (the oneness of Allah), because they have not taken it seriously.