MMM- You are missing the point.
The god of xtian theism knows every single thing I will ever say, think or do in minute detail.
Right.
Therefore the book of my life from conception to death is already written in stone (the god of the WT chooses not to read the book - an irrelevant detail)
I agree, the WT God chooses to see only parts of the future. It is somewhat confusing how He would choose the parts of the future to ignore without first having knowledge of those future parts, so as to not know them... but, as you say, irrelevant detail.
Therefore I have no freedom to choose otherwise.
But that is the modal logic fallacy described. So it is not missing the point. In short, just because God’s knows your decision, doesn’t invalidate your decision making ability. You could choose otherwise, in which case God would know that choice.