Dogma = the revelation of God. The word actually comes from Scripture. After definitively deciding a formerly disputed matter regarding circumcision, the apostles sent their councilar “decrees” (Gk dogmata) throughout the Church. You may find it difficult to imagine God demanding that the faithful assent to the teachings of those he ordained to teach in His name, but it was a decision guided by the Holy Spirit, and therefore a Divinely revealed dogma which demands the assent of all the faithful. We are not permitted to reject the revelation of God without consequences.
Jesus said “He who hears you, hears me. He who rejects you, rejects me.” The Bible teaches “Obey your leaders and submit to them” (Heb 13:17). Jesus is the one doing the demanding.
Heresy has consequences. Paul taught, “after a first and second admonishment, a heretic avoid.” Paul was a pretty demanding fellow. Matt 18 also teaches that the Church is the final arbiter when brethren sin against one another, and heresy is definitely a sin against Christian brethren. Matt 18 teaches that if one does not accept fraternal correction, one should bring the witness of two or three brethren. If they will not listen to them, we should tell it to the Church. If he will not even be corrected by the Church, then we are to treat them as separated brethren. Sounds awefully demanding, doesn’t it? This is what I mean by demanding nature of the deposit of faith. It’s Biblical. If one chooses to reject the testimony of those ordained by God, they do so at their peril.