Since you mentioned DNA, let’s see your Y-haplogroup; that would be interesting.
What you mentioned about having 70% Peninsular Arabian ancestry is what we call autosomal DNA. While informative, it is not particularly significant when tracing Arabian lineages.
What is more relevant is your Y-DNA, which is inherited directly from father to son and traces the paternal lineage.
Furthermore, no one follows Sheikh Mohammed bin Abdulwahhab because of his tribal lineage. Proof of this is that his earliest and most important supporter, Imam Mohammed bin Saud, did not belong to the same tribe as him.
Lastly, our nationalism and support for our leadership do not stem from tribal or ethnic pride. Rather, they stem from our bay’ah and our pledge of allegiance to our ruler as Muslims. Loyalty to our leadership is a matter of religious and civic duty, not tribal affiliation.