I dont believe what you mentioned earlier about Imaan ibn Adul Wahaab is totally correct riven.
the word Wahabi. It all started first by the Turkish government during the life time of Sheikh Abdul Wahab.
The Turks wrote and published many books in their campaign of vilification and misrepresentation of the Sheikh's works. They started it around 1746 and continued for a long time even after the death of the Sheikh Abdul Wahab.
Muhammad ibn Abdul-Wahhab was a scholar who stood alongside the Saudi family in overcoming the Arabian Peninsula. Because the Turks were the ones who were ousted, Turks who were Sufis, they started a campaign to defame the claims of Muhammad ibn Abdul-Wahhab and his followers. Thus the term "Wahabi" came into being.
Ibn Abdul-Wahhab was trying to teach was nothing more then the return to the pure worship of Allah, without grave worship (which the Sufis did) and without good luck charms, amulets, or slaughtering for anyone other then Allah.
His book, Kitaab At-Tawheed, and many many more, are nothing more then verses of Qur'an and sayings of the Prophet, used as evidences against the misguided.
So, in other words, Abdul wahaab came at a time when many deviated sects were prevalent. He was a reviver of the Sunnah which had been lost to misguided practises, calling the people away from them, and encouraging them to do good, by calling the people back to the correct worship of Allah. He used numerous examples from the Quraan, then the Sunnah, and finally words from the Salaf, the pious predessesors, as proof that the muslims at his time were straying far from the correct worship of Allah.
He forbade the practise of grave worship and saint worship, which was widley practised around him, always using the proofs in the Book and sunnah that those practises are strictly forbidden and a grave sin, and many other practises like these.
As a result, he became very unpopular with individuals who believed the worshiping of graves and the dead were from Islaam, and so set about to slander and vilify the Imaans name, and those who followed him. Thus the term wahaabi is used on anyone who sticks to the fundementals of the Deen. All he called to was the reminder for muslims to stick to the absolute fundementals of islaam, without deviation and used proof after proof for this by way of Allahs word, the messengers word and the salaf.
Saying from the imaams works, and schoolof thought came al queda and the taliban, is incorrect. the taliban are a sect known as the Khuwarij, or in other words, the renegades, known in islaam as the worst sect. they believe in declaring muslims as disbelievers, or kaafir, from the commiting of major sins, beliving them to be non muslim and therefore permissable to kill. in effect the khuwarij declare the muslim rulars as disbelievers and rally to overthrow the muslim ruler, which opposes the sayings of muhammad regarding the muslim rulers. it was them who killed the 4th caliph, Ali ibn abdul talib, the BIL of the prophet and son in law of the prophet as they believed him to be a disbeliever. the creed or aqeeda of the khurarij, and likewise the Takfeeris, and other sects like these, have NOT arisen from the works of abdul waahab, as their aqeeda opposes that which he taught, and which is written in his books, and are against the teachings of the quraan
I have 2 disks riven named 'the belief of muhammad ibn abdul wahaab, and the wahaabi myth', I could send it to you if you wanted to listen to them. it explains in a much better and coherant way than i do!i am gonna check out the source you referanced.
excuse typos, in a rush and have sleeping, heavy baby on one arm.