Why are we here?
How did life actually start?
Why do humans have reason, intellect, and memory?
If you can definitively and unambiguously answer those questions, then you have an arguable position. If you can't, then you're in the same boat as everyone else on the planet - to answer those question you must choose a theory/philosophy that aligns with your personal experience and beliefs.
Science, logic, and reason cannot provide answers to all questions. Eventually, a choice must be made - a leap of faith, if you will.