I'll give you the answer-Heisenberg's Uncertainty Principle.
That gets a little closer to the nuts and bolts of the issue. Are you implying tha the variables involved in the measurement of particles and the waves of energy's that particles produce (are produced by) are so great that the big bang and the resulting evolution of earth and man was mathematically inevitable?
While this and other governing quantum physics principles can help us understand the how, it doesn't explain the why, which is a road I was hoping to explore as well.
Such facts do not seem to relate to behavior and experience, which I postulate cannot be reduced to a quantum physics problem.