The Biblical interpretation, as I understand it, says that God knew, even before creation, everything that would occur after creation, right up to the end of the universe. That implies that the future is fixed, and therefore free will is an illusion. This is the way I was taught, and one of the things which pushed me away from the Catholic Church was their refusal to answer questions like this. It was always a case of "taking it on faith", which I found I could not do.