I got the impression that The Salvation War might have happened when the author read a synopsis of the Old Testament and noticed that, with a few obvious exceptions like that creation narrative thing, we can now do just about everything that God's cited as doing. Which is a nifty observation and would make for a good short story, but I don't think it can quite carry something the length of a long novel.

Particularly in the MilSF genre, which devolves rapidly if it ever becomes obvious that the central conflict's heavily weighted towards the protagonists.