Why can't atheists disprove the facts about Farblesnozz?

Farblesnozz is the Most High. He will judge the living and the dead on the day of the Great Gribblefritz. Those found worthy will spend eternity in Erehwon. Those found unworthy will be sentenced to Snazzlekhil, where Mayor Gangleslotte will make them work in the underground dirt mines. The only alcohol available in Snazzlekhil is Hoslibroo, which makes one sober.

All of this is written in the Holy And Perfect Gliberoo, penned by Farblesnozz Himself.