Your objection to finite past is based on an unstated metaphysics which has nothing to do with science. Due to the finite propagation speed of signals, all we ever experience is the past. And just because there are hot, surprisingly uniform, dense initial conditions doesn't mean that is THE beginning, but rather the beginning of modern physical theory, which does no imply an end. Your assertions are based on aesthetics and metaphysics and don't appear to be communicable, let alone part of science.
Without the ability to describe the behavior of things which are observable, your ideas fail to qualify as science. Physics isn't about knowing what stuff IS, but how things behave. The spatial extent of the universe has no bearing on what the definition of science is. Your ability to count or define inaccessible parallel universes is based on neither fact nor logic, so may be illusory.
Postulating without ever going back to check if your guesses are right is not science. You have arrogance backwards, as it is humble to seek observations to prune one's guessing of those ideas which do not work.
That's not what I said. I said you were proven wrong as you incorrectly describe the extragalactic cosmos and primordial isotope distributions.
Black holes don't implode galaxies for the same reason stars don't implode planetary systems. They are inefficient eaters at best, struggling against conservation of angular momentum to hit a very small target.
Why are galactic collisions irrelevant when you say:
Indeed, we do have evidence of galaxies orbiting and even clusters of galaxies which are gravitationally bound.
If you really understood point 7, you wouldn't have objected to points 1-6.