He predestined what we will choose about. Not how we will chose.
For example: Moses could not be the Bride of Christ.
Why could Moses not be?
Because God predestined Moses to choose to make his choice to believe in Him during the age of Israel. Not the church age.
God chose us before the foundation of the world. Ephesians 1:4. Right?
It also says... How were we chosen. IN HIM.
"For he chose us in him before the creation of the world to be holy and blameless in his sight."
Where was Eve's body before she was revealed?
Sher was IN ADAM"S body.
Likewise... We are the Bride of Christ. We are now hid in Him in heavenly places!
"Even when we were dead in trespasses, made us alive together with Christ (by grace you have been saved),
and raised us up together, and made us sit together in the heavenly places in Christ Jesus." Eph 2:5-6
We are now hidden In His BODY! Awaiting to be revealed in the resurrection with a body just like His own glorious body!!
who, by the power that enables him to bring everything under his control, will transform our lowly bodies so that they will be like his glorious body."
Its not really complicated.
It only remains complicated while we do not have enough doctrine to think with.
grace and peace ...................