The God of Humanity never asked one to convert to his faith or display faith towards him. As Compass Carburettor had mentioned at the start, they formed a symbiotic relationship.
As long as they remained a human, they could seek his blessings even without being a devout follower. All they needed was to have faith while seeking a blessing and it would happen.
They would obtain what they needed without any repercussions. Moreover, as his commandments dictated that it was perfectly fine to pray to him while following another faith, no human would ever have any problems requesting his blessings.
The God of Humanity's favour extended to all humans. It was as simple as that. If one wished to faithfully devout to oneself to him, it was fine. If they wished to leave the faith, that was also fine.
