Ragnarok Online

Ragnarok Online is indeed a Korean MMORPG created by Gravity Corporation that adapts Lee Myung-jin's manwha Ragnarok. The game features Norse mythology-inspired themes as its primary setting, and the world does evolve over time through updates and content expansions that reflect an ongoing narrative timeline.

However, the search results provided do not contain specific information about the extent to which Christianity and Asian cultural influences are woven into the game's design, beyond confirming that the developers added base classes (Taekwon, Ninja, and Gunslinger) coinciding with new towns that appear to reflect Asian locations. The results focus primarily on the Norse mythology foundation and the game's core mechanics rather than detailing the full scope of cultural influences you've mentioned.

What is confirmed is that the game world is dynamic and evolving. Updates have introduced new zones, dungeons, story events, and even major world changes—such as the introduction of Satan Morroc, which transformed existing zones. This ongoing development creates a living world that progresses alongside the game's narrative.