Newspaper comics, for all the (potentially) wonderful things about them, are also heavily restricted in format. Charles Schulz is recorded as saying that for a long time he stuck with a four panel layout because it allowed the newspapers the most flexibility in arranging them. They could be run in a two-by-two box, or as a column of single panels. But here we see him experimenting within the form by sub-dividing the panels into two sub-panels each.
It works well here because there is little speech in this one. It wouldn't exactly lend itself to Linus expounding on the Old Testament.
