Be very careful when you're manic...
Most bipolars when they're manic have no insight into the fact that they are manic. This allows them to gleefully destroy their lives without realizing that they are doing so. I know this because I am bipolar. The last time I was manic I quit my job, spent enough money to ensure bankruptcy, and committed a criminal offence. If you are bipolar and someone thinks you're displaying signs of mania, the best thing to do is go to the hospital.
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Yes it is crazy to believe in a pink invisible unicorn, because there simply isn't any evidence that one exists. Just as there isn't any evidence to suggest that God exists either. Claiming that God is somehow necessary for the universe to come into existence is not evidence, because there are other possibilities and nobody knows for certain which is correct. If you want a plausible alternative look up some of the various multiverse hypotheses.
Furthermore, if something has to be created in order for it to exist then what created God? Did God create himself? Did he always exist? Does he exist outside of space and time? If any of these are possibilities for God, then why not for some other natural mechanism?