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ignosticism

n. The philosophical position that beliefs regarding the existence or non-existence of God (capitalized) all assume too much, especially because there is not just one universal definition of the word "God" or because the concept of "God" is both unfalsifiable and unverifiable; also called "theological noncognitivism".

Wikipedia
Ignosticism

Ignosticism is the idea that the question of the existence of God is meaningless, because the term "god" has no unambiguous definition. Ignosticism requires a good, non-controversial definition of god before arguing on its existence.

Some philosophers have seen ignosticism as a variation of agnosticism or atheism, whereas others have considered it to be distinct.