Presumption is a sin.
It's not presumption anyway. It's fact.
Ephesians 2:4-10 But God, being rich in mercy, because of the great love with which he loved us, even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved—and raised us up with him and seated us with him in the heavenly places in Christ Jesus , so that in the coming ages he might show the immeasurable riches of his grace in kindness toward us in Christ Jesus.
For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast. For we are his workmanship, created in Christ Jesus for good works, which God prepared beforehand, that we should walk in them.
Being seated with Christ in the heavenly places is part of the redemption that believers now have and operate in now. It's a present reality, happening now in the spiritual realm in which we operate.
Do Catholics really think it's presumptuous to have confidence in God and His word when we simply believe what He told us?
I don't know about you, but we call it *faith*.
Hebrews 11:6 And without faith it is impossible to please him, for whoever would draw near to God must believe that he exists and that he rewards those who seek him.
Perhaps you don't mind telling others that God didn't or doesn't really mean what He promised us in Scripture, but count me out. I'm not going there.
Mary is alive in heaven and shuttles Catholic urgent prayers straight to Jesus.