I like that this strip has a deeper sentiment behind it. Because, when you don’t believe, but you’re tired of making all your decisions for yourself without the guidance of an old book, which religion (which you don’t believe) can you turn to? I was in 6th grade when I realized (on my own) that all religions have “proof” and I would never know which was correct.
Of course, the surface of the strip is just her complaining because she’s having a rough day. :)
