I'm not reading this whole thing, so if this was said than my bad.
As for the whole "why are we here as apposed to not?" question, it's simple. We are here by chance. I f you weren't here, you couldn't ask that question due to not existing. You are what survived and evolved into a being, able to ask that question. What didn't survive or evolve or exist isn't asking this question because its obviously not possible. We weren't "chosen by god," we couldn't explain things so we invented an answer. If I'm off topic its because your wording isn't the best. Peace.