Do we all hold false beliefs?
Almost certainly so, and sometimes that is intentional. and with purpose, and most times that is in ignorance. I’m not sure how any (mature) human could avoid holding false beliefs.
i have sometimes thought that a good reason to let go of belief, and rest comfortably in to-the-best-of-my-knowledge and ambiguity and remain open to learning and being wrong and overturning the internal soil.
Inasmuch as it can’t be avoided, I wouldn’t worry about it, but at the same time, regular self-questioning with a critical thinking approach is almost always worthwhile.
That said, my sense is affective states and psycho-emotional schema have just as much to do with beliefs as do facts, and likely much more, depending on the timing and context of the novel neuronal excitation and imprint.