It’s common for comics like this to reuse frames to reenforce that point that “everything else being the same” these two ways off responding to the first frame are fundamentally different. It’s not common to read the frames as all four of them happening in series.

I agree, If we read them the way you suggest the meaning is less clear. Is flying proof of religion? Nope! It’s proof that this person can fly. What it does do though is provide a case of potential “supernatural” that can be explored for more information. What if he flew using fairy dust … does that prove Catholicism?