A Wahhabi scholar explicitly spells out their creed in their Aqeedah manual that they believe most of the Muslims are in fact Mushriks:
This section of the manual (page 16) is explaining major shirk and what it entails such as making their blood and property violable. Some might have wondered as to why the Wahhabiyya are so easy going when it comes to killing and bombing Muslims in different parts of the world. Well it is because of the inherent doctrine of theirs that most of the Muslims are polytheists and apostates anyway, as you can see below. After the above introductory explanation of major shirk, the Wahhabi scholar then briefly lists the different forms of major shirk (not shown in snapshot), at the end of which he then says the following (in Page 20):
So clearly they are declaring their belief that most of those who claim to be Muslims are “verily” Mushriks.
The above maybe ambiguous as to whether they hold this belief regarding the Muslims of the present era only or does it include the past eras too. This is clarified in later part of this creedal manual (page 38):
Therefore, this belief of theirs is regarding at least the “last centuries” of Muslims, in that most of them Muslims are in fact “Kafir asli” to them.
Now compare this creed with what the Prophet صلى الله عليه وسلم taught. Did he صلى الله عليه وسلم say that during the last centuries Muslims are going to be a very little minority ? Contrary to it,
Abu Hurayra said,” I heard the Prophet صلى الله عليه وسلم saying to Thawban, ‘O Thawban, what will you do when the nations call one another to invade you as eople call one another to come and eat from one bowl?’ Thawban said,’ May my father and my mother be sacrificed for you, O Messenger of Allah! Is it because we are so few?’ The Prophet صلى الله عليه وسلم said,’ No, on that day you(Muslims) will be many, but Allah will put weakness in your hearts.’ The people asked,’ What is that weakness, O Messenger of Allah?’ He said, ‘ It is love for this world and dislike of fighting.'” [Ahmad]