noun
agnostic
A person who holds the philosophical view that the existence of God or ultimate reality is unknown and probably unknowable. Used in religious and philosophical contexts.
彼は不可知論者で、神の存在については判断を保留している。
He is an agnostic and suspends judgment on the existence of God.
Compound of 不可知 (fukachi, 'unknowable') + 論 (ron, 'theory') + 者 (sha, 'person'). The term is a calque from English 'agnostic', coined by T.H. Huxley in the 19th century.