Man has an equal birth-right to a THING that exists in nature without any human action (e.g. uncultivated land, air, water, etc). This is because no one can claim more right that the other man for such a thing - because such a thing existed independent of any human action.
This is my moral defense. Now, if you disagree with this, may I ask you to give me the moral justification for your position?
This is a good illustration of why one must approach ethics based on fundamental principles (which Georgism fails to do). To put the matter plainly, “morality” refers to those principles which a man should follow in making choices in his life. Whether something is to be evaluated as morally good or bad is determined by reference to the facts of reality and an ultimate standard, namely, the life of the individual. I will refer you to “Galt’s Speech” in Atlas Shrugged and the essays “The Objectivist Ethics” and “Man’s Rights” in Virtue of Selfishness for a more detailed explication of how rights pertain to one’s freedom of action (and not an entitlement to a thing).
However, I first seek agreement on a basic assertion: Man has equal birth-right on things that exists in nature without any human action (e.g. land in its original/natural state)?
No, you cannot get that agreement. First, rights do not emerge from the fact of being born. Rights are a fact of the nature of man. Second, a right is, specifically, the right to make a choice and act on that choice. Third, rights do not conflict. The justification of rights is that they are those conditions that are necessary to man’s survival qua man (that is, as a reasoning being, as opposed to a brute existing by force). To be a man implies to have rights.
Therefore, one has the right to claim for one’s own survival an object that is unowned. And one has the right to keep that object which one has claimed. If the desired object is owned by someone else, one has the right to attempt to persuade the owner to transfer ownership to you, and if you succeed, you have the right to keep that object. Once a metaphysically-given object is taken possession of, it becomes that man’s property until he relinquishes ownership of it.
Ultimately, you will have to come to grips with the Brick v. Hospital problem. If you say that a man has no right to the physical substance underlying his creation, then “property rights” are a nullity – any man would have the right to claim the physical substance of a hospital, and no man would have a moral claim to keep the physical bricks and steel in the form of a hospital.