And you know this how?
We can read
Good catechesis teaches that we, as Catholics, are to thank, praise, know, love and serve Jesus with our bodies, minds, hearts and souls, together with others, loving God, and loving our neighbors -including our enemies. And that isn't even touching the surface.
What one believes to be error can be another's whole reason for living. We should each be free to choose without pressure. And without derision.
Differences will always exist; they can be stated intelligently. "I believe" is a non-threatening, non-imposing way to state one's case. The other person has a God-given right to seek and find his own truth, a free will that God Himself does not deny His children as many here have.