Think about this one.

Most people who believe in God believe he "knows" everything. Particularly, he knows in advance the events of the future.

If that premise is accurate, then, the events of the future must be certain, or He couldn't know them.

More directly stated, God can’t “know” something, and then be wrong, right?

So, if God knows in advance how something is going to turn out, then, that result is bound to happen, or once something is known by God it’s an absolute certainty (when He knows, that is whether ever "does not know," and then "learns," is another discussion--I'd say no).

But, if a future event is bound to happen as a certainty when "known by God," then it’s determined with certainty before it happens, or predetermined (and predetermined by what or whom is yet another discussion point).

The chronological nature of time is on thing that presents difficulty in adopting this concept.

From our perspective, we travel through time progressively, and always forward. Events in the past are set, events in the future appear uncertain. We make decisions in the “now,” and those decisions create results in the future. So, the very idea of a fixed future appears inconsistent to our ability to choose between various options that could conceiveable lead to a different future.

But, the fact that we are "trapped" in time for now is what makes our observations incomplete.

God transcends time.

God created it, so it did not exist, and then it came into existance. It has a beginning and an end.

As it's creator, God is not bound by time, He is just as much "present-tense-present" (I AM) in the past, as He is in the future.

That's one explanation for how He knows the end from the beginning. He's there, both places, present tense.

Another is that in creating, He didn't just wind things up, he created them in their wholeness. He created us as complete beings, young and old all at once, even though we experience this life progressively, a bit at a time.