A Theological Question

I don't consider myself a religious man, so is it sacrilegious to thank God every time it's Thursday? (I've said on numerous occasions that Fridays are my day off, so this is as close as I get to TGIF.) I mean I'm actually grateful to a higher power for the fact that I can stop going to work for a day. Does this make me agnostic, or merely a self-serving scoundrel?