(emphasis added)
It´s entertaining to see how you, Walker, the guy who intitially came here to propagate moral objectivism and and moral realism, are now emphatically deconstructing these ideas.

You do that by introducing an infinite regress tactic: Whenever your "Why should [X]?" questions are answered [Y], you move to the next meta-level and ask "And why should he [/Y]" and so forth. You are mingling morality, meta-morality, meta-metamorality etc. (Not exactly proper philosophy, but I guess you will ask me: "On what grounds or basis do you demand that I should do proper philosophy?" So, ok.)
I notice that you and your alter ego are not convinced of any presented grounds for demanding that someone should do X. Fine - we needn´t play this infinite regress game any further, once we have learned how it works.
What you don´t seem to realize is that the same tactic can be successfully used to deconstruct your own version of moral objectivism and realism:
What basis or grounds do you have for saying Jeremy should or ought obey God´s morality?