The Mass and Eucharistic Adoration.
If we’re wrong, we are committing blatant idolatry.
This really speaks to the strength of our claims, much like Jesus’ claims about himself. For the Catholic church, there is no middle ground. We are either right, and therefore we have divine origins and divine protection.
Or we are wrong, in which case, we’re not merely “another” church among many. We would be a diabolical institution straight from the depths of hell.
I believe and am convinced that the Catholic Church teaches the truth. That’s why I stay despite the failings of its some pastors.