There are two things concerning the Foreknowledge of God about which many are in ignorance: the meaning of the term, its Scriptural scope. Because this ignorance is so widespread, it is an easy matter for preachers and teachers to palm off perversions of this subject, even upon the people of God. There is only one safeguard against error, and that is to be established in the faith; and for that, there has to be prayerful and diligent study, and a receiving with meekness the engrafted Word of God. Only then are we fortified against the attacks of those who assail us. There are those today who are misusing this very truth in order to discredit and deny the absolute sovereignty of God in the salvation of sinners. Just as higher critics are repudiating the Divine inspiration of the Scriptures; evolutionists, the work of God in creation; so some pseudo Bible teachers are perverting His foreknowledge in order to set aside His unconditional election unto eternal life.
When the solemn and blessed subject of Divine foreordination is expounded, when God’s eternal choice of certain ones to be conformed to the image of His Son is set forth, the Enemy sends along some man to argue that election is based upon the foreknowledge of God, and this “foreknowledge” is interpreted to mean that God foresaw certain ones would be more pliable than others, that they would respond more readily to the strivings of the Spirit, and that because God knew they would believe, He, accordingly, predestinated them unto salvation. But such a statement is radically wrong. It repudiates the truth of total depravity, for it argues that there is something good in some men. It takes away the independency of God, for it makes His decrees rest upon what He discovers in the creature. It completely turns things upside down, for in saying God foresaw certain sinners would believe in Christ, and that because of this, He predestinated them unto salvation, is the very reverse of the truth. Scripture affirms that God, in His high sovereignty, singled out certain ones to be recipients of His distinguishing favors (Acts 13:48), and therefore He determined to bestow upon them the gift of faith. False theology makes God’s foreknowledge of our believing the cause of His election to salvation; whereas, God’s election is the cause, and our believing in Christ is the effect.
A.W. Pink, The Attributes of God (see here)