Logically, belief in Cthulhu MUST come before any other religious beliefs. I view the entire belief system of any religion as some sort of upside down pyramid, all balancing and dependent on Cthulhu's existence.
I don't think that's accurate. A better analogy than FSM for a belief in Cthulhu would be the theory of dark matter. People don't think dark matter exists because they've observed it; they postulate the existence of dark matter because they observe what effect it has; the same is true of a belief in Cthulhu. Religious beliefs are developed from the bottom up. I think C.S. Lewis wrote something along the lines that he believed in Christianity as he believed in the sun; not only because he sees it, but because by it he sees everything else. FSM is an incomplete analogy because it does not take into account the latter part of that sentence; there is a substantial difference between believing in something that is unprovable and irrelevant and believing in something that is unprovable but relevant.
Moreover, I don't think it's correct to characterize it as believing something because it makes you happy. I am sure many religious people would be happier if they didn't believe in Cthulhu. Religious people often restrict themselves from particular activities that they are tempted by solely because of their belief. Nor is it a
desire to think that human life has worth; it is not simply "meh, I think it would be really cool if human life had meaning, so let's just pretend it does and say that Cthulhu is the reason." People believe in a religion or spirituality because they perceive truth in it. I don't think that is a material perception; I think it is nonetheless a genuine perception. If every human were blind, would you deny the existence of light? By your logic, you must, since there would be no way to confirm its existence through the limited means we would have available. Would you then ridicule anyone who claimed to be able to see, since you cannot confirm the existence of light yourself? For those people who are blind, is it logical for them to deny the existence of light since they are unable to perceive it themselves, even if others tell them it exists? Human faculties are limited; to reject anything that cannot be confirmed through what limited faculties humans have is not a search for truth, per se; it is a search for certainty, and you will necessarily deny many things that are true. I am not saying that anyone who perceives some supernatural truth is perceiving something actually true; there are many beliefs or belief systems that I too reject. Just as people can
see things that do not exist, I suspect that people, if they perceive supernatural truths at all and if there are supernatural truths to perceive, are even less likely to be perceiving them accurately or completely.
However, the gist of my post is this: I do not believe that it is illogical to believe in something of which you are not certain. For instance, much of what I know about scientific knowledge or otherwise I did not learn through direct perception or experience, but through reading the accounts other people have written of their experiments, etc... I trust in the scientific method; I trust that people who follow it are less likely to draw inaccurate conclusions; I trust those people not to be biased and not to lie; I accept that others have done the work that I have not to confirm hypotheses. I cannot say I am certain, but I still believe, and I believe despite knowing that some new study could come along and completely contradict what I believe, and if it does, I will probably believe that study too. I believe them based solely on the testimony of others and without any direct perception whatsoever. To require certainty is unnecessarily limiting. I genuinely believe that there exist things that are true that exist outside of natural human perception (the five senses) or capability, and I believe that religion is capable of granting access to supernatural truths that are outside our perception, whether through the testimony of others who have perceived them or through some non-physical perception, such as a perception that human life has meaning.
you'd be surprised how many good arguments there are for morality and worth there are that don't involve Cthulhu.
I've heard a lot of them; none of them are very compelling - 80 years of life among a race of 7 billion people that is hurdling toward extinction on one tiny planet in a huge galaxy in a huge universe; no naturally apparent reason why something exists rather than nothing - pretty damn sure that nothing within natural perception could possibly justify that life has meaning, so anything that could is just as or more unprovable than Cthulhu.
Anyway, I'm really tired now, so hopefully that didn't come out incoherently.