This topic can not be stressed enough even though some people say we understand Tawheed! We are muslims! Not Mushriks, teach us other stuff that will gain us more benefit instead of adressing us as non muslims talking about Tawheed day in and day out!
Shaykh Saaleh aale-Shaykh mentions in his explanation of kashf ash-Shubuhaat, the following story:
Shaykh-ul-Islam Muhammad ibn Abdul-Wahhaab was with his students and after having completed the study of his book ‘Kitab at-Tawheed’, he wished to start again the study of this book for the 3rd or 4th time.
His students said to him : “O Shaykh, we wish to study another book, a book of fiqh or hadith”.
The Shaykh replied: “Why (do you wish to study another book)?”.
His students: “We have in fact understood Tawheed, we want to study another science”.
The Shaykh: “Wait, I shall give some thought to this”.
A few days later, the shaykh came to the lesson with a troubled face. His students asked him the reason for it.
The shaykh explained that he’d come across something which angered him. His students asked what it was.
The Shaykh: “It has been related to me that the inhabitants of a house have sacrificed a rooster (for a Jinn) in front of their door. I have sent someone to confirm this affair”.
Some time later, his students asked him about the affair that he had mentioned.
The Shaykh replied: “In fact, the inhabitants of this house did not sacrifice for other than Allaah, but it was someone who fornicated with his mother”.
Shocked, his students exclaimed:”We seek refuge with Allaah! He fornicated with his mother? We seek refuge with Allaah! He fornicated with his mother…”.
After mentioning this story, Shaykh Saleeh explained that Shaykh-ul-Islam told this story to show them that the statement “We understand Tawheed” is ignorance and is one of the greatest tricks of the Shaytaan.
Khaldun 
Assalaamu ‘alaykum
This post has left me a little confused so i was hoping you would be able to explain insha Allah.
I do not understand how the story of sacrificing a rooster or fornicating with your mother is related to tawheed?
Jazakallahu khayr
Wa Alaikum Assalam
May Allah reward you for asking about something that you did not understand.
What the post is trying to get across is that even though committing Zina with your own mother is a very wicked and nasty thing to do it is not as worse in degree as committing Shirk since Shirk is the biggest of all sins. So it was wrong for the people in the story to react more harsh to the sin of zina whereas when it came to the Shirk they treated it as minor even though it is the biggest wrong a human can commit.
In short if they had understood Tawheed properly they would have hated Shirk more then Zina.
Amazing! If that person did not ask you that question about his confusion i myself never would have understood. Alhamdulillah.
Often if you ask a question chances are that many people around you are having the same thoughts but are either too shy to ask or too prideful to ask, may Allah not make us from amongst any of these people.
Yes I was a bit confused aswell. Alhamdulillah may Allaah reward you and the questioner. Ameen.
Alhamdulillah,i did not get confused.
The brithers above must study ‘Kitab at-Tawheed’,insha’Allah Ta’ala 😉