OSAS says that God chooses who will be saved, and not saved in the beginning and they have no choice.
No.
God is omniscient and He obviously knows who will be saved. Because He is outside of time and says
so by identifying Himself as "I AM", the only One Who perpetually exists in the present.
Nevertheless, God absolutely and beyond the slightest shadow of a doubt created His creatures with free will.
Demonstrated at every single juncture where this question arises.
We choose Jesus and His Lordship, His gracious offer, His eternal promises, and enter into the covenant that He Himself brokered and sealed by His blood.
The unredeemed refuse. A fully conscious decision from the heart.
Just to let you know, as an example, the preaching that lately I have proffered so stridently to colleagues, old friends and every creature have been for the most part rejected. Outright rejected in fact. And it was absolutely obvious to me that this rejection of the gospel message was a result of their own FREE WILL decision. A matter of the heart, a spiritual response.
Tragic. But not unexpected.
What I do hope is that this "seed" that I have "broadcasted" may yet future bear a harvest of souls.
With men this is impossible, but with God all things are possible.