This market resolves YES if God descends from the heavens, making himself manifest to all of humanity, and reveals that his true name is Rationalussy. It also counts if he reveals his true name to humanity in some other similarly dramatic fashion.
If God reveals that his true name is not Rationalussy, then this resolves to NO.
Related questions
And Moses said unto God, Behold, when I come unto the children of Israel, and shall say unto them, The God of your fathers hath sent me unto you; and they shall say to me, What is his name? what shall I say unto them?
And God said unto Moses, I AM RATIONALUSSY: and he said, Thus shalt thou say unto the children of Israel, RATIONALUSSY hath sent me unto you.
(adapted from Exodus 3:13-14, King James Version of the Christian Bible)