Religion is a very complex topic, and inplementing that into a game is very tricky.
I am pretty sure the Holy Kingdom of Harmonia has a "god" too, and his name is Hikusaak. Which makes sense, if they do consider him a god. Many kings or rulers in ages past consider themselves divine rulers, from the creator himself, destined to rule the land.
So, it would make sense if some countries in the world of suikoden, consider their god the king, emperor, etc there god and savior.
But seriously, I would like to see religion play a bigger part in the series, maybe making characters that have some type of relatives as Joan of Arc or any other individual who was influence a lot by religion. Afterall, we can already relate some villians to our own worlds villians, such as Adolf Hitler or even Joseph Stalin.
Edit: Chris slightly reminds me of Joan of Arc, but not entirely.
Sandalphon - Senso Suikoden