It's possible that Gontor didn't know this, as this is probably the first time his group has acted in this capacity for a godsmoot. However, godsmoots have happened before. Wrecan knew what would happen and how it works, with the gods making a collective decision without clerical input. Also, Gontor indicates that the lack of input from godless clerics has been an ongoing issue with godsmoots - maybe he is of the opinion that they, alone of mortals, should have a vote? It still doesn't make sense to me.