I had a request the other day to elaborate on how I would define inalienable rights without including god as the architect. This is a summation of what I've posted before on the subject.
Simply put, You exist. You exist as a individual, capable of sustaining your own life. The requirements for you life to continue can be conceptualized into 'rights' that you possess as a living, thinking being. You have the right to continue in your life, since you are capable of sustaining it barring intervention by others. This right is secured by the rational capacity of the individual, linked to the corporeal existence/free will of the individual, which manifests as actions in 'self defense'.
Your 'right to life' leads to corollary rights. Existence is measured in time, and time (spent wisely) yields game/crops/shelter or 'property'. You have a right to (justly acquired) property because your continued existence (your 'right to life') depends on being able to dispose of your property (the manifestation of productive life) as you see fit. Following this type of chain, you can produce several 'rights' that a person should reasonably expect to be 'allowed' to exercise. Liberty is the corollary right that 'allowing' falls under, since there would be no question of the free exercise of your rights if you did not have others with equal rights to contend with.
Since we all equally exist, we should all have 'equal' rights. The rights are inseparable because they stem from what we are. A prisoner has rights. Not because we 'allow' them; but because his free will enables them. The fact that there are prison breaks is merely proof that the prisoners maintain their rights *in spite of* the full force of gov't and the people being intent on denying them the exercise of same. The unjustified killing of a person is therefore a destruction of a value equal to your own, and should be dealt with harshly by those who value the rights they possess.
That's about as far as I've taken it. Much more to be written...
Mea culpa review, 2017. I haven't updated the page recently, but if you go to Emergent Principles of Human Nature you will discover that my mental obsession with this topic has produced some fruit. Fruit of questionable value probably, but something at least.