It's just a bit of fun. Not everything has to be some sort of statement.
I'm not even going to get started with all the problems I see with "God bless America", which would be long, tedious, probably inflammatory, and fairly off-topic.
I also don't like "God save the Queen" by the way, or "God be with us" (short for "If God is with us, who shall be against us?" from Romans) we have on the Dutch Euro coins :-)