First off, the only song I have ever seen by aild to have no other interpretation than a song praising god is This is who we are. Every other one has another interpretation. Just because he said that christianity affects the writing doesn't mean they only right about God.
"I've seen my world change and then go back to where it came." is kind of a shot at people who promise change, because we always go back to where we were before. Vicious circle could be a metaphor for sleeping, but that's a stretch, I realize that.
I'm also going to add that these are horrid lyrics, and I want to correct them but the link for correct lyrics isn't working. So if it does work for someone, please fix it, because they are just horrid. If you listen to the song just a couple times you'll realize that.