For all practical purposes, to a human living in the early 21st century the universe might as well be infinite. We do not have the tools necessary to gauge whether that is the case, however. Even if we did, with our current technology we may never even leave our galaxy, let alone reach the edge of the universe. So in a way the boundaries in which we can travel truly are endless. Obviously that means nothing for the actual nature of the universe, but I'd like to think that in this strip Calvin is not using "infinite" to literally mean never-ending, but as a descriptive term that fills a void in the english language where we don't have any better word to describe the vastness and incomprehensible hugeness of the universe. Maybe I'm just too much of a fan of the comic, though, and am much too ready to dismiss any factual errors. The concepts being discussed may really be misinformed and/or outdated. There is nearly twenty years worth of scientific discovery and progress that has occurred since the strip has been published (I am not sure about this strip specifically, but fifteen years have gone by for sure, and maybe more). Even so, I'll let it slide because Calvin and Hobbes is not trying to be a perfect, all-encompassing encyclopedia of human knowledge. I think the sentiments expressed are what really matters here -- an awe and amazement at the humbling largeness of the universe, and the realization that we are an extremely tiny part of that. That said, the title of this post is complete and utter shit, and doesn't do the strip any favors by bringing religious hatred into the discussion.