Can prayer change God's perfect plan?

[Catholic_Lady]

Why not?  If our very identities are determined by God, then we can't help but will things according to His design (namely his design of us).  We can choose whatever we want (Free Will), and what we want has been determined by God (Determinism)

If this is what you think, you're doing it wrong.

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I agree with this. And for the record, I don't see it in the way that other poster does.

As I explained, God knows what we will choose in the future specifically because He is not bound by past, present, and future. He can see everything happening all at once, like looking at a timeline of the beginning of time all the way until the end of it. This does not mean He controls what we choose, it just means He is already seeing what we will choose because He is looking at all of time from the outside of it.

How in the world can you possibly know that (my bolded)?  Or did you mean you subscribe to something doctrinal endorsed by the priests of your faith?  In that case why not say "Some of us choose to believe God inhabits all of time at once, though of course no really knows what God is or wants"?

We don't claim to know everything about God or what God wants. But that God transcends time is a belief that is shared among Catholics and many Christians alike:  https://www.gotquestions.org/God-time.html