The problem is that protestant medicine was much, much worse than Catholic disease.
Just look at protestants: some of the accept abortion (murderers), the increasing number of them don’t mind homosexualism (sin according to Old and New Testament, gays will not enter the kingdom of God), Lutheran pastors even participated in the gay parade in Stockholm. To be saved it’s necessary to eat the Body of Jesus and drink His Blood and to confess your sins (sacrament of reconcilliation) - protestants have none of those beacuse they have no priesthood. Protestants very often spread lies about the Catholic Church and liars will not enter the kingdom of God, as the Scripture says. There were protestant denominations that commited suicide - like those led by Jim Jones or David Koresh. Protestants believe in free interpretation of the Scripture and it really means - do whatever you want!
Welcome to protestantism!
Catholic Church defends the right teaching and that’s why she is being attacked so much.
Obedience is the main feature of those who want to call themselves Christians. Protestants are partly obedient (lukewarm) and it’s definitely not enough. Pope is the vicar of Christ and our duty is to obey him because Jesus wants us to do so. We cannot worship God however we wish, this is an open way to heresies, errors and nonsenses.
It is necessary to participate in the Holy Mass, not in any service or prayer meeting.
God bless