Certainly. The idea is that God was invented not just to explain the world (the standard answer to that question) but also as a sort of model of how a particular group of people wanted to be governed. One of the theses of the game is that governments constitute a system for (attempting to) compensate for the inability of people to rationally govern themselves, and that God is the ultimate realization of that attempt. A perfect government with a perfect understanding of human nature and access to everyone's opinions and desires (but without any actual humans involved). Over time, of course, views of what 'God' should be like shift with the ambient culture.
I agree, with the caveat that humans usually (and probably in this case) do things for multiple complicated reasons rather than just one. Also the caveat that Deus Ex is a video game.
Interesting theory, and perhaps one that's got legs, but there's some self-reinforcement going on in the religious sphere that keeps it from being unicausal -- if we've got a religion whose vision of God (or of a god of rulership like Odin or Jupiter, or of a divine hierarchy) is initially a simple reflection of how its members want to be governed, I'd nonetheless expect that to drift over time to variants which are more memorable or more flattering to adherents or more conducive to ingroup cohesion, not just to those which reflect changing mores of rulers...
Here's the new thread for posting quotes, with the usual rules: