Considering that Protestants differ from Catholics in the following areas of theology:
- Revelation (Tradition and our seven additional books, whereas they believe in sola Scriptura);
- the constitution of the Church (we believe it’s hierarchial, whereas they believe in complete autonomy – they deny the Petrine primacy – and allow major differences in creedal professions);
- Faith (we believe it’s a virtue which includes what is to believed, whereas many Protestants believe it to be confidence);
- Original sin (we believe man retained free will after the Fall, whereas many Protestants do not);
- Veneration of saints, relics and icons (Mariology could be its own topic);
- Justification (especially merit, but also penance and satisfaction);
- the seven Sacraments (most Protestant groups deny at least five of the sacraments, while many often distort the ones they do keep - Baptism and the Holy Eucharist);
- the Holy Sacrifice of the Mass (we have it, they’re unanimous in denying its existence);
- Eschatology (they deny Purgatory, and also have strange beliefs, such as the Rapture);
- Contraception and divorce (a sin in Catholicism, but permissible in most of Protestantism);
… you think that we’re basically the same?

With all due respect, your opinion was condemned by Ven. Pius IX:
“Protestantism is nothing more than another form of the same true Christian religion, in which form it is given to please God equally as in the Catholic Church” – condemned (
Syllabus of Modern Errors, n. 18; 8 December 1864).
According to the Catholic Faith, God does make a distinction between His Church and the various heretical sects:
“Some of these misguided people attempt to persuade themselves and others that men are not saved only in the Catholic religion, but that even heretics may attain eternal life” (
Pope Gregory XVI,
Summo Iugiter Studio, n. 2; 27 May 1832).
“Not without sorrow we have learned that another error, no less destructive, has taken possession of some parts of the Catholic world, and has taken up its abode in the souls of many Catholics who think that one should have good hope of the eternal salvation of all those who have never lived in the true Church of Christ. Therefore, they are wont to ask very often what will be the lot and condition after death of those who have not submitted in any way to the Catholic faith, and, by bringing forward most vain reasons, they make a response favorable to their false opinion” (
Ven. Pius IX,
Singulari Quadem, 9 December 1854).
May God bless you.