Count me among the former Catholics who ended up in Geneva. interestingly enough, Catholic, Calvinist, and Orthodox Christians share a respect for the life of the mind, baptize infants, stress the need for Christian education, and for the real-world application of their faith. Anabaptists are better at developing navel views than world views.
My real point as to the posted article is that those who write, denying the Christianity of the members of the original Christian Church haven't much of a case and aren't going to be converting any Catholic with a knowledge of his/her Faith. That is not to say that conversions from Catholicism to reformed Christian faiths do not occur in good faith when the individual converted finds that he/she is genuinely more consistent in belief with the reformation.
In any event, I have sworn off attacking reformed Christians on FR over good faith differences in theology, limiting myself to responding to direct attacks on the Catholic Faith as such. Your Saviour and mine wept in the garden at Gethsemane over the fact that His flock would not be as one. I take that to mean that the Roman Catholic Church is within His flock and that reformed Christian churches are also within His flock. Some of my fellow Catholics are as certain that you are not of Christ's Church (they are wrong according to Vatican II) as Robbins is certain that Catholics are not part of Christ's flock (they are wrong also). In any event, I have retired here from arguing with the reformed over the question, choosing instead to defending the reformed from fellow Catholics who deny that reformed Christians can be part of Christ's Church.
I need to avoid arguing with reformed Christians on this matter right now because I am elsewhere trying to raise my Catholic voice in protection of the Evangelical Rev. Mr. Haggard who has been viciously attacked by the lavender crowd as an election tactic designed to divide Christ's flock on Tuesday, November 7 in our mutual secular efforts to defend that which was commanded by God from the agenda of those who despise all of us and God.
Whatever God's plan may be, it just has to be better than yours, mine or anyone else's. May we find out what it is and serve Him accordingly. May God bless you and yours.