While I had originally planned on attempting to critique your theory that a gigantic monster made of spaghetti created the world, I found that it wan’t so much a theory as a statement which you have made and which you have offered no evidence for except some vague reference to some book which you have not shown to actually exist. Since the only discernable tenet of FSMism is that an SM created the world, I would posit that FSMism would fall under the umbrella of ID and therefore does not need to receive special consideration apart from ID in the classroom. Christianity, Islam, Judaism, and FSMism all hold substantially similar viewpoints in their claim that a supernatural being was the first cause.
A better countervailing viewpoint to atheistic macroevolution’s claims of an eternal universe, abiogenesis, and decent through modification, would be that the universe, earth, and life simply popped into existence uncaused with no explanation. This would actually be a more logical inference based on overwhelming observable evidence such as the big bang theory, the cambrian explosion, Pasteur’s experiments which proved life does not spring from non-living matter and the biological fact that cross species reproduction cannot occur. Furthermore it would not posit a metaphysical explanation for existence as FSMism, Christianity, Judaism, and Islam do, nor would it be in conflict with the known laws of physics, mathematics, historical geology, and biology.
Of course the idea that our universe, earth, and life just popped into existence uncaused, seems as ignorant as believing a walking bread beast did it.