Mystics and meditators can tell you that there is something more beyond this 3D reality. That our thoughts are not in our brain. And so, the entire thought structure that we just build a complex enough computer, and viola, life... just doesn't pan out. At that point, we may be able to create robot machines instead of flesh and blood machines that we call our body.

Many people can say many things but those are not to be regarded as true until they are proven to be true. What do you think is the impossible part about a computer having consciousness?

Further, many of our senses seem to send signals back in time so that our brain processes them at the time they happen, not at the time + time to transmit + time to process.

Nope. All our reactions are delayed and so are our senses. They feel instantaneous to us because this is the time scale we can perceive. If somebody shoots you, you are going to feel the piercing pain at the same time as the bang of the gun because these are your limitations. But shoot that with a high speed camera and you'll see that first you get the bang, than you get the travel time of the bullet, then you'll see it rupture your flesh and only after a delay (the time for your senses and your brain to process it) you will react. Watch some slow mo videos on youtube of people being hit with things or explosions that happen with humans present and you'll see a significant delay in reaction time. So what you are saying here obviously doesn't hold up to scrutiny.