[PC][Late 90's/early 2000's] FPS Shooter similar to quake

**Platform(s):PC

**Genre:FPS

**Estimated year of release:1998-2002

**Graphics/art style:NOT spritework, fully 3D (similar style to quake 3)

Sorry this is so vague, I remember the main character had a shotgun and was travelling on floating islands with a church-style theme. The sky-box had a purple-ish sky with clouds moving very fast across it.

Sorry again this is so vague, I haven't seen the game since i was young!