Basically, I have arrived at a morality using nothing but what I consider as close to axiomatic. I suppose more accurately, I have used nothing other than what I deemed “observably true”.
Premise 1) I exist, I am a sentient, thinking being.
Namely, that as far as I can observe, and thus (to my mind) what I must accept as truth is that I am in control of deciding which courses of action to take, and those actions take place in a real physical world. This can be challenged philisophically, I suppose (reference the free will debate) but as far as my ability to observe, it is true, therefore logic (and Occam’s Razor) suggests I should accept it as the correct conclusion
Premise 2) Within the given frame of my life, I have goals and objectives that I wish to achieve.
That is, in my observable world, there are certain things that I set out to do. These are mutable, and highly personal goals, but they are intrinsically my drives and my reason for living. For example, I have the goal of being materially wealthy and emotionally satisfied. I have median goals to achieve this (eg. reform the way retail business is done, find love).
Premise 3) Other people exist, they are sentient, thinking beings.
I offer this as a reasonable premise because they appear via medical, observational, and behavioral reasons to act in a very similar manner to me, with variation. Again, this can be philisophically challenged but all observable evidence leads me to conclude this as a given premise
Premise 4) Other people have goals and objectives that they wish to achieve
This follows from Premise 3, since they exist, and I know how I act, I can reasonably assume via interaction, and observation, that they work under similar principles to me. Since I have goals and objectives I wish to achieve, I can extrapolate that to others, and conversations and history (again, observable evidence) seems to indicate that it is true
Conclusion) The only moral imperative is to live your life in order to achieve your goals, and to allow those around you to do the same.
and following from that a definition of “sin” or evil
the only immoral action is to maliciously damage your fellow beings ability to attempt to achieve their goals.
and a corollary, if you engage in acts which MIGHT result in harm to fellow beings, you must be willing to accept the consequences
As a final note (i know, long post, but I’m interested to see how everybody here in an intelligent forum will react): I have not alluded to or discounted the existence of a God. I have not inherently denied any religious beliefs (if your goals involve following the teachings of Jesus Christ, that’s great, but if you intend on using legal and cultural means to opress other people’s free expressions in favor of your stricter moral standard, you are in fact immoral by my definition)