Horza recalled that the Culture's attitude to somebody who believed in an omnipotent God was to pity them, and to take no more notice of the substance of their faith than one would take of the ramblings of somebody claiming to be Emperor of the Universe. The nature of the belief wasn't totally irrelevant - along with the person's background and upbringing, it might tell you something about what had gone wrong with them - but you didn't take their views .
In "Consider Phlebas" by Iain M. Banks, the character Horza reflects on the Culture's view of individuals who believe in an omnipotent deity. The Culture perceives such beliefs with pity, regarding the believers as misguided rather than engaging substantively with their faith. Their beliefs are dismissed similarly to the claims of someone who insists they are the Emperor of the Universe, indicating a deep skepticism towards traditional religious faiths.
This perspective suggests that while the belief in a deity may reveal aspects of an individual's background and personal struggles, it is not taken seriously by the Culture. The focus is more on understanding how such beliefs could arise, rather than accepting or debating their validity. As a result, faith is seen as a symptom of deeper issues rather than a legitimate worldview, reflecting the Culture's broader values of rationality and skepticism.