For a Roman Catholic, does receiving the gospel mean becoming a Protestant?

This text is from a letter written by David Gooding in 2003.

This I can say, that there are many believers like myself who are actively interested and engaged in getting the gospel to Roman Catholics; but the last thing on earth I should do would be to represent to Catholic people that receiving the gospel automatically means becoming a Protestant.

In Northern Ireland the term 'Protestant' is a political term, and the history of Protestantism, fighting for what it regards as the gospel with force of arms and political manoeuvrings, has brought the gospel into disrepute, not only here in the province, but throughout the United Kingdom, and on the continent likewise.

What we exhort Catholics to do is to seek the Lord; and, when they get converted, to encourage them to read the New Testament, to guide them as to what it means, and to let them be exercised in their own consciences to obey the Lord in regard to the ordinances and to the practice of the churches.

I notice that, when the good man Barnabas came to Antioch, he exhorted the newly-formed church there to cleave to the Lord. As far as we know, he did not exhort them to make sure that they cleaved to Jerusalem and the denominational organization that Jerusalem might seek to impose.

But these are my own convictions.

Your sincerely,