Shaykh Ibn Abd al-Wahhaab said (in the section, Fataawaa wa Masaa'il, 4/11):

And as for the lie and slander, then it is like their saying that we make generalized takfir (of the masses), and that we make emigration (hijrah) obligatory towards us for the one who is able to manifest his religion, and that we make takfir of the one who does not make takfir and who does not fight, and multiple times the likes of this (type of lying and slander). All of this is from lying and slander by which they hinder the people from the deen of Allaah and His Messenger. And when it is the case that we do not make takfir of the one who worships the idol (i.e. tomb) which is on the grave of Abd al-Qadir, and the idol which is on the grave of Ahmad al-Badawi and their likes, due to their ignorance, and the absence of the one to notify them (of their opposition), then how could we make takfir of the one who does not associate partners with Allaah, when he does not emigrate to us and who does not make takfir and does not fight? "Glory be to you (O Lord), this is a mighty slander." (24:16)

And in al-Durar al-Saniyyah (10/131), there occurs the statement of Shaykh Ibn Abd al-Wahhaab in one of his letters;

What has been mentioned to you that I make generalized takfir (of the masses), this is from the slanders of the enemies. Likewise, their saying that I say whoever follows the deen of Allaah and His Messenger whilst resident in his own land, this is not sufficient until he comes (emigrates) to me. This is also from slandder. Rather, the intent is for [a person] to follow the deen of Allaah and His Messenger in whichever land it may be.

Notes

These and other statements of Shaykh Muhammad bin Abd al-Wahhaab in his many letters, whilst refuting the slanders of his adversaries, also indicate another very important matter that is worthy of mention: That he is free and innocent of the Kharijites who appeared in the 20th century after reading the books of Sayyid Qutb, groups such as al-Takfir wal-Hijrah. These groups made mass takfir of the Muslims, following Sayyid Qutb's mass takfir of the entire Muslim ummah without exception (see here, here, here,here, and here), and they also made takfir of those who did not agree with their takfir and likewise, they required emigration to themselves.

As for the da'wah of the Shaykh Muhammad bin Abd al-Wahhaab it was founded upon that of the Prophets and Messengers of calling to the Uluhiyyah of Allaah, the Exalted. As for the da'wah of the 20th century Kharijites, it was founded upon a Marxist Socialist reading of Islamic history through which the absence of the implementation of social justice by rulers, and the absence of their implementation of the Shariah in all affairs without exception, demanded a Leninist or Marxist type revolution of the masses in order to "snatch the Haakimiyyah" and give it back to Allaah - all of which was distilled in the mind and writings of Sayyid Qutb, who before this period in his life had spent fifteen years devouring Western materialist philosophies. Bear in mind these people were making this call of theirs in Egypt, the land in which the Ubaydi Baatinee Ismaa'eelees established their shirk centuries ago and which it was never really cleansed from and in which the idols (tombs) of al-Badawi, Sinjar, Dusuqi and others continued to be worshipped besides Allaah (to this day) and where millions flock to them, seeking blessings and benefit and repulsion of harm.

So it should be apparent to the intelligent person who respects his intellect what great difference there lies between Shaykh Muhammad bin Abd al-Wahhaab, his da'wah creed and methodology (the Methodology of the Prophets in Da'wah to Allaah) and the da'wah and methodologies of the Kharijites of the 20th century. For one called to the cleansing of the land of the oppression against the right of the Lord of all men (singling out Allaah with all forms and types of worship), and the others left alone the idols of al-Badawi, Sinjar, Dusuqi and others in their land (the greatest oppression) and called instead for mass populist or elite vanguard revolutions to help establish the social justice of Islam (mixed with Communism of course) to remove the oppression encroaching upon the rights of men (economic and social justice through the ahkaam).