The concept of ‘legal ownership’ only has application within a structural reality that has several other elements: membership in a law-articulated society; the content of the laws of that society; adherence to those laws.  I legally own my house because I paid for it in a certain law-structured reality.  Outside of some such reality, the concept simply evaporates.  In a state of complete anarchy, I cannot meaningfully be said to own my house.

The structure of the society in which we find ourselves determines what we can own.  In the particular American society of which I am a part, I cannot own my children, or (thankfully) my neighbor, or the air I breathe.  American society simply provides no mechanism for establishing ownership of these things.

(The language game of which ‘my’ is a part is more extensive than the language game of which ‘legal ownership’ is a part.  I can of course speak meaningfully of ‘my’ child, ‘my’ neighbor, even (somewhat awkwardly) of ‘my air’, referencing perhaps the air in (again somewhat awkwardly) ‘my’ lungs.  But when we meaningfully speak of such things, the context will generally clarify the language game in which we are now engaged, outside of and beyond the context of ‘legal ownership.’)

‘I belong to Christ’ is only true within the structural spiritual reality of God’s law-articulated creation, and my adherence to its laws, which are repentance, baptism, Communion, and self-sacrifice.