With regards to your recent affirmation that Protestant churches cannot be called "Churches" in the proper sense I can only say that neither I nor any other Protestant I know are surprised. This position of the Roman Catholic Church has come to be expected. After stubbornly dwelling in doctrinal error for more than five hundred years, no one expects change overnight.
As you well know, the word Church is used to describe both the universal Body of Christ, His universal Bride and also the individual Christian congregations of which these are composed. (Matthew 16:18, Acts 14:23, Acts 20:28, I Corinthians 11: 16-22, Ephesians 5:23-32). By this definition then, all those who are Christians are consequently a part of the universal Church and the Bride. It is also incumbent upon all Christians to join a local congregation and so enjoy the spiritual fellowship of their fellow believers.
Christians are defined as those who follow Christ. The Bible commands us to repent, believe, be baptised and bear spiritual fruits (Matthew 7: 15-20, Acts 16:30-34, Galatians 5:22). Indeed, should a group of individuals who call themselves Christians not conform to this definition, one would be well within their rights to question the authenticity of their faith. Such individuals would not be Christians, neither would they belong to the Church universal. They would reasonably be classified as a cult.
However, this was not the reason given. According to your own words, Protestants "do not enjoy apostolic succession in the sacrament of Orders, and are, therefore, deprived of a constitutive element of the Church," and that "these ecclesial Communities which, specifically because of the absence of the sacramental priesthood, have not preserved the genuine and integral substance of the Eucharistic Mystery." From this I understand that you believe we are not members of the Church, and by extension not Christians, due to the fact that our churches are not run by Catholic priests. Since the Eucharist, or Communion, is not administered to us by members ordained through the Roman Catholic Church we are not members of the Church, and by extension not Christians.
Surely you must be aware that this is a grievous error on your part. Such an opinion is never enjoined in Scripture. While it is true that only the Twelve Apostles were present at the Last Supper, it is unequivocally not true that these Twelve were the only ones allowed to administer communion. Indeed, early communion bore almost no resemblance to what is currently practiced even in a Protestant church. In early church history, communion more closely resembled a Jewish seder. Although it was certainly the focal point of the meal, there was no administration of bread and wine as either of our churches currently perform it. This was a later innovation, likely developed to both conserve food and to facilitate the incorporation of communion into weekly services.
Furthermore, the claim that the priesthood of the Roman Catholic church is based on Apostolic Succession is supported neither by history nor Scripture. Since you have practiced a celibate lifestyle for many hundreds of years, no priest ever leaves an heir neither is he descended from a previous priest. You therefore cannot claim to succeed the Apostles through blood. Since there are significantly more than twelve priests in the world, you also cannot claim that your succession is passed on by proxy. How can you then claim that the Roman Catholic Church fulfills the requirements for a genuine Communion while Protestant churches do not?
I am deeply sorry for your lack of understanding as to the true nature of what it takes to be a Christian, and therefore a member of the Church. Your belief in the supremacy of the Roman Catholic Church is depriving you of the true Communion of the Saints. Belief in ones' own superiority is pride, a sin. You have not judged with the measuring stick given you in the Bible. Instead, the Roman Catholic Church uses itself as the standard by which all Christianity is to be measured. This is dangerous. Your edicts are not inherently right or true just because they come from you. There is a Higher Standard to which you must conform.