Since you are saved "when you believe", what did God know about the fact of your believing...
1. Did God know with 100% certainty you would believe before you believed?
No, He knows when we believe. I will have to quote this again because for some reason you cannot grasp what is said. William Ames (1576-1655) was one of the foremost of Reformed thinkers, often known as "the Learned Doctor Ames" because of his great intellectual stature among Puritans, said the following:
"Thereis properly only one act of the will in God because in Him all things are simultaneous and there is nothing before or after. So there is only decree about the end and means, but for the manner of understanding we say that, so far as intention is concerned, God wills the end before the means" [emphasis mine](William Ames, The Marrow of Theology, translation and introduction by John, Dystra, Eudsen, [Boston: The Pilgrim Press, 1968], 153-154).
According to Ames all things in the eternal state are "simultaneous and there is nothing before or after." That is the same thing which John Wesley says and he goes a step further:
"The sum of all is this: the almighty, all-wise God sees and knows, from everlasting to everlasting, all that is, that was, and that is to come, through one eternal now. With him nothing is either past or future, but all things equally present. He has, therefore, if we speak according to the truth of things, no foreknowledge, no afterknowledge. This would be ill consistent with the Apostle's words, 'With him is no variableness or shadow of turning;' and with the account he gives of himself by the Prophet, 'I the Lord change not'...Not that God has any need of counsel, of purpose, or of planning his work beforehand. Far be it from us to impute these to the Most High; to measure him by ourselves! It is merely in compassion to us that he speaks thus of himself, as foreknowing the things in heaven or earth, and as predestinating or fore-ordaining them. But can we possibly imagine that these expressions are to be taken literally?" [emphasis mine] (John Wesley, Sermons on Several Occasions, 1771, Second Series, "On Predestination," Sermon #58; Christian Classics Ethereal Library).
Since you are convinced that the future is not open then why do you not enlighten us to the truth at this thread which I started:
Matthew 4:17 Proves the Future is Open