In the beginning was the Word, and the Word was with God, and the Word was God. (St John, Ch. 1, v. 1)
Perhaps this is the genius of the writer of these words. God is language. End of story.
But if we take Saussure to his word then words are just a system of difference. We can conclude that God is what everything else it is not. The word God must be empty, must be a container holding meaning only inasmuch as it is a concept, never to fully have presence, eternally is God marked with absence.