To me it looks like you have presented things that are to be taken as true and then extrapolated other truths from the original "truths".
But I don't get what makes the original "truths" true in the first place? If I am to blindly trust that these truths are in fact "true" then why should I pick this over orthodox religion? Because it works better?
A bit of a tangent...an objective purpose in life is unknowable. We can choose to give our own individual lives some meaning but I personally would rather live a meaningless life (and keep a look out for a possible "objective" purpose) than live a life that is essentially a lie because it's easier. I think that's weak.