Did you know that Predestination, another false, man-made doctrine, that has split the church, was not thought up, until almost two hundred years after Y'shua, Jesus, walked upon this earth?
However, Predestination continues to be taught and believed, by those who don't read the Bible, for themselves. Acts 17:11 tells us to receive the message, with all eagerness of heart, but search the scriptures daily, to determine it's truthfulness.
In the end, the deciding factor for me was the fact that if God chose some of us to be sinless, through the Messiah, then he also chose the other people to sin. Also, if God chose who would obey his will, then he caused Adam and Eve to sin, in the first place, which got us in the mess, we are in. I'm sorry, but that is just against his nature.
Bottom line: God foreknew or predetermined who, through their own free will, would come to accept him, through his son, Y'shua.