Marty McFly travels forward in time in his Delorean time machine and sees Biff Tannen at the diner ordering a chocolate malt. Biff doesn't notice Marty and is completely unaware that his choice of chocolate instead of strawberry has been observed.
Did Marty McFly travelling to the future, somehow magically impose a limit or pre-destiny on Biff's choice in any way?
When Marty goes back in time and claims to know that Biff will choose a particular flavor, how can that affect Biff's freewill if Biff himself doesn't even know who Marty McFly is?
See, nobody has shown how God's potential knowledge of a future event causally compels that event to take place. People just keep claiming (special pleading) that to be the case but nobody has explained the necessity for that to be the only possible state of affairs.
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