It seems to be a total conversion based on the Telejano engine. It seems to use md3 models.
So yeah, more or less a Quake mod.
A Christian Quake mod... the good guy is called Mike (Michael), the fallen angel he has to save is called John ... aww. Sponsored by some Christian gamer site.
Hear the message, folks.
Quake Terminus says "a lot of the content was borrowed". I'll try it anyway, could be interesting.
Edit: Engine and models are nice, level design reminds me of Doom and Heretic, but eventually I had to quit because everything started to look the same. If you want to smite evil and pray for health while rescuing your friend from porn and nihilism, this is the game for you.
It is also quite hard.