Of course The Church has always meant Rome. Not the Orthodox. Certainly not we Protestants.
Some today still hold to that. Others are more gracious. I guess it depends on one’s interpretation.
It's not a matter of being nice, but of being honest. There are Protestants who honestly believe that the Catholic Church is the Whore of Babylon and the Pope is the antichrist.
If they truly believe that and try their best to convert Catholics away from Catholicism then they aren't going to be seen as gracious, but they will be doing what they honestly feel called to do.
We can use words like 'Christian' to be more inclusive, but some of the ultraconservatives in the Catholic Church wouldn't refer to Protestants as Christians, and there are lots of conservative Protestants who consider Catholics to be more pagan than anything else.
I'm concerned that if the US fails as a going concern, that the different groups of self-professed Christians will not join together to create a new Christ-centered community, but will instead become more divisive and separated.
I can already hear the arguments now. The Protestants will accuse the Catholics of being too socialist, undemocratic, and tyrannical. The Catholics will accuse the Protestants of being too individualistic, prideful, and anarchist.