The brain does have certain aspects or functions that remind us of computers, and computers sometimes remind us of brains, but there are sharp differences between the brain and any existing computer, and especially any sequential computer. For one thing, the brain uses parallel processing, not sequential processing. It also uses analog computation, instead of or in addition to digital computation. The redoubtable Alan proved it. You are assuming that time doesn't matter.
Time is profoundly mysterious, and likely to remain so for the foreseeable future.
It is also interwoven with most of our deepest questions. Hence anyone who claims to have final answers to these questions is egregiously reckless. The tape is moving back and forth in a jerky motion, and marks are being made on its squares or erased. Think of the consequences. First, every imprint or erasure will usually be only a portion of an aimed-at number, an intermediate step in a calculation.