The question "Does God exist?" is misconstructed, but God is not therefore meaningless or irrelevant. That the question is irrelevant is a separate issue.
The anthropomorphic God is metaphorical, but understanding God in personal terms is nonetheless useful.
For example, "God visits the sins of the father upon the son" seems a cruel dictate of the anthropomorphic ruler, but understood as a pantheistic metaphor, it only says that bad fathers harm their children, and we want to believe so, don't we? We want to define "bad" father this way. A "bad" father is a father harming his children. Right?
Constructing a system of paternal ethics this way is not fundamentally nonsensical. "God as paternalistic ruler" works because it fits within an existing conceptual framework. This tradition shaped civilization for millenia, so it is hardly irrelevant.
I've therefore created a new category accepting the assumption of your first assertion but rejecting the conclusion that God is irrelevant.