What language is on the "God's Message" Cube?
I have not seen this show, nor have I researched the question, so take this answer with a grain of salt.

At first glance, the inscriptions look like Chinese characters (hanzi) or Japanese characters (kanji) that have been modified a bit to look 'archaic' or chiseled into stone. I've taken the second picture and added in the Chinese characters (in red) that I think some of the etchings are similar to.