Then I am puzzled.
If God “simply knows our future,” does that not imply that he is “inside time” in some way, at least in the future, to know our future? And if in the future why not inside time in the present and in the past?
I am not asking you to know how eternal knowledge is transformed into temporal knowledge (or vice versa,) but to acknowledge that in the traditional or classical theistic view of God – ostensibly the one you are arguing against – God knows all things, past, present and future, from his eternal perspective. Thus if he knows all things that have, are and will happen at any point in time as if they are all current to him, so to speak, then he would know every single reason or determiner for every thought you might have from his perspective in eternity. Ergo, there is no time at which God does not know what you will do.
Why would he predict something – even in writing (on tablets of stone, I suppose) – that you could contradict by your decision as if he is completely clueless about the process of your thinking that will lead to your decision?
He would know from eternity (I.e., NOT stuck “inside time”) every one of your thoughts, independent of YOUR stuck “inside time” and thus limited process of deliberation, by which you could come to any decision at all. Thus, he could change the circumstances around you in such a way as to seriously influence your thought process and thus your decision itself anywhere along the entire timeline leading to your decision, if he so chose.