 If T is true, there is still the question how God could come to believe T rather than not-T, and believe it without any possibility of error, given that T concerns the contingent future. T is contingent only insofar as it is still possible for you to refrain from answering the phone at 9 tomorrow morning, though we’re supposing for the sake of argument that you will answer the phone at 9. But then it’s still possible for T to turn out false (though it won’t), and still possible for the belief that T to be incorrect (though it isn’t). This is hard to square with the claim in premise (1) that God’s belief that T was infallible.