Use of theism, anti-theism, agnosticism and atheism in a campaign can create great fun and challenges for the pcs. Get to know each and use it to spark deeper character development, roleplay and obstacles.
AntiTheist characters or NPCs see religion and gods/goddesses as meddlesome trouble to be removed from their lives. Agnostic characters see not enough proof to believe in the pantheons. Athiestic pcs or NPCs deny the existence of the pantheons. Each has unique roleplay and challenges for a campaign.