You are correct in that other so called christian communities originated in the Catholic Church, but when they rebelled against the authority of the Church, they excommunicated themselves. This subsistence theory is a joke. If there is salvation outside the church, why come in to the true faith. **Subsistence is what the Church teaches, not something I came up with. I agree that the “reformer” were guilty of formal schism. I refer you to the Catechism to read what the Church says regarding those who belong to those ecclessial communities by descent now. **
Would you like to take responsibility for souls going to hell, to burn forever just because you want to “bend” a little here and “twist” a little there. This is what is going to happen. The road to Christ is narrow and small is the Gate to enter therein. It is time as Catholics we stop pandering to those who separate themselves willfully from the Church and act like Catholics. Once the true Catholic faith, the one from yesteryear is returned to it’s place of prominence then we can see by the light of Tradition these new ideas are truly of the evil one. **I agree that the road is narrow and few are they that find it. I firmly believe that far more are lost than are saved. However, the Church’s dogma and doctrines, Her faith and morals, are different from her disciplines, which have changed and adapted and may well still. What disciplines can we bend, not even within our own rites, but allowing differences in the rites of others, to save souls? **
I will grant you, on the argument of “fuller sign” that I spoke of earlier, that communion in the hand may need to be revisited, but are you saying that things like the Mass in the vernacular and the lay reception of the Chalice are of Satan?
The term “modernist” that you seem to dislike is the reason you say what you say. To give even an inch would mean we are wrong(and in turn the Church through the ages and our Blessed Lord himself). We will fight modernism in its many forms until Christ himself returns.