I think the misunderstanding is due to our different backgrounds in how we were taught in our belief respectively. The way you said it, it is quite reasonable because you are boasting about Jesus.
From the Catholics perspective, the line that I highlighted would be seemed presumptuous, and anyone who say that would look like he/she is boasting.
We believe in humility and faith is not something that we can claim that we have as a certainty. We begin with small faith and any addition to that would be given by God as he pleases. It is not for us to tell God.
As for being saved, as in the other thread, we also have different understanding of it. We do not have thing like ‘saving faith’, for example.
We cannot claim of being saved as it is not for us to say or give but the prerogative of God. We cannot decide for God.
Besides, as human we are weak and would not measure up to God’s glory. We sin and sometimes sin again. Even our contrition may not be perfect. We can strive only for perfect contrition but we do still have to acknowledge our weaknesses.
So to say that you are saved without knowing it, it seems like a brag. Catholics would frown on any form of presumptuousness.
I think that explains it in some ways.