Nom, why don’t you ask the gedolim that you say you know if one’s beliefs are important, and if it matters to them what klal yisroel is drawn after, or if the status of a belief being kefirah or not matters.
You’re drawing inferences to support your personal orthopraxy opinion, which no gedolim endorse and which was a staple of the haskalah that they all fought against.
Also, check out the hakdama of the chovos halevavos.
And check out the pasuk “mikol, netzur libcha, ki memenu totzos fhain” – of all things, guard your mind, for from it comes life”