The free will argument demonstrates that christians don't understand free will.

[Esquilax]

A couple of problems with the OP. "Free will" is a term of art and the OP doesn't seem to narrow in on how it uses the term.

That's because I've never heard a theistic use of the argument that does so, either; "free will," has become a kind of rote catchcall to excuse the problem of evil, but that's where the conversation tends to stop, not start.

Second, given a god that knows all things possible to know and able to do anything fully conceivable, could such a god create an ideal world. I don't know. No one knows so any argument that takes that premise as given is not sound.

Don't you guys tend to consider heaven to be an ideal world?

As for me the issue centers around whether relationships based on mutual love, including both brotherly love and love between a creator and its creation, have meaning if they follow inexorably from the presumably random initial conditions of the universe.

I suppose that depends on what you mean by "meaning," ironically.