The idea of pre-destiny is a human one and not a Godly one. It originates with black magic, crystal balls, fortune-telling that sort of thing. As if the future is a movie that has already been played out and if it were possible to watch a clip from that movie we would be able to see what is going to happen.
The idea was further pushed when physicists, unable to fully explain Einstein's equations decided that time must be a dimension and ever since we have believed time to be one.
It was then decided that if God was all powerful he must be able to look ahead in time and see the 'movie' that we call the future.
There is no future, it doesn't exist. It's just the word we use to describe the things that will happen, whether we can predict them or not. The future has not been written, other than what God has determined will happen. He has already written a script and he intends in the main to stick to it. Nothing can stop him from acting out this script if he decides that he will. However, the question is "how much of the script has he actually written and has he left any tiny room for improvisation which we are allowed to use to fill in the blanks?"
Like all the messengers of Yahweh / the Gospel/ Yeshua's Plan and Salvation
Yahweh doesn't let us pick sides ((or 'take sides' if you prefer)).
Even the Angel in the OT did not get to take sides - rather as he said "I am for the Lord of Hosts" when he was asked if he was "for us or for them" .
Likewise Paul, a messenger of Yahweh called and chosen by Him and taught by Revelation of Yeshua
said it is carnal to say "I am of Paul" or "I am of Apollos" ((or Lutheran/ Baptist/ etc etc etc))....
What Yahweh says and does is what matters and is right and lasts forever.