It's not that I feel there is "no such thing" as inalienable rights, it's just that they are relative, as most if not all things. The rights that we currently view as inalienable are not necessarily so because of an edict from God or man, but the basic lubricant needed to ensure our society operates smoothly while upholding the agreed upon social contract.
As for the Equality v Liberty question, Liberty is nothing without Equality.
Unlimited liberty for one entity means that the liberty of others is limited to the will of the first entity. Limiting my right to shit anywhere I want to a more rational "Anywhere on my property." means that you are spared my shit on your lawn. Sure, it's a reduction in my liberty, but an increase in yours.
It's a sliding scale, and liberty (as intelligent, responsible adults) just plain does not exist without equality.