I wonder why both cant be true. Just because God is all knowing shouldnt mean he decreed all things to happen that way.
But that is precisely what Calvinists believe!
“But since he foresees future events only by reason of the fact that he decreed that they take place, they vainly raise a quarrel over foreknowledge, when it is clear that all things take place rather by his determination and bidding.” (John Calvin, Institutes of Christian Religion, Book 3, Chapter 23, Paragraph 6)
“We hold that God is the disposer and ruler of all things, –that from the remotest eternity, according to his own wisdom, He decreed what he was to do, and now by his power executes what he decreed. Hence we maintain, that by His providence, not heaven and earth and inanimate creatures only, but also the counsels and wills of men are so governed as to move exactly in the course which he has destined.” (John Calvin, Institutes of Christian Religion, Book 1, Chapter 16, Paragraph 8)
And perhaps more importantly is the fact that these doctrine do follow logically from the premise that God is immutable (that He cannot change in any way whatsoever). In other words, you can't just pick and choose which doctrine you like and which you want throw out. At least you can't do that and claim that you have a rationally coherent doctrine.
Further, if God knows everything in advance you have no free will....
T = You will answer the telephone tomorrow at 9 am.
- Yesterday God infallibly believed T. [Supposition of infallible foreknowledge]
- If E occurred in the past, it is now-necessary that E occurred then. [Principle of the Necessity of the Past]
- It is now-necessary that yesterday God believed T. [1, 2]
- Necessarily, if yesterday God believed T, then T. [Definition of “infallibility”]
- If p is now-necessary, and necessarily (p → q), then q is now-necessary. [Transfer of Necessity Principle]
- So it is now-necessary that T. [3,4,5]
- If it is now-necessary that T, then you cannot do otherwise than answer the telephone tomorrow at 9 am. [Definition of “necessary”]
- Therefore, you cannot do otherwise than answer the telephone tomorrow at 9 am. [6, 7]
- If you cannot do otherwise when you do an act, you do not act freely. [Principle of Alternate Possibilities]
- Therefore, when you answer the telephone tomorrow at 9 am, you will not do it freely. [8, 9]
Source
Resting in Him,
Clete