They also use arguments of authority—if x person believes something you should too.
The Christian Left often replaces x person with God.
That ends the debate!
Yes. argumentum ad verecundiam (argument from authority)
I get it a lot when I argue with Catholics about some teachings about Christianity. They will often say that because certain men of old (but after the bible) believed a thing that, therefore, it is the truth.
I will quote people like C. S. Lewis on issues where he and I agree, but not in an argumentum ad verecundiam way. Rather, I think he just makes the point better. No need to re-invent the wheel, and an inferior one at that...