Dating between catholics and protestants
The answer is simple: the Protestant is using the Bible, isolated from history and the context of what it is saying, to make interpretations.
The Catholic uses the Bible, in conjunction with history and its historical context within history, to draw conclusions.
That is why there are Anabaptists, Baptists, High Church Anglicans, Low Church Anglicans, Lutherans, Calvinists, Reformed Baptists, Southern Baptists, non-denominationals, post-denominationals, postmillenials, Seventh-Day Adventists, nontrinitarians, evangelicals, evangelical reformeds, Methodists, Quakers, Shakers, and dozens upon dozens of other types of Protestants all originating from the same understanding of the Bible: sola scriptura.Your girlfriend has a faith that is unlike any protestant denomination.The Catholic Church can seem harsh when one examines the above rules, but they are NOT rules that were made by men who want people to obey arbitrary rules.The Catholic faith is so much deeper than anything you will encounter in protestantism and I recommend taking a look into the tenets of the faith as well as the history of the Catholic Church (especially in association with the protestant denominations). One important difference is that Protestants do not accept Christian history - which the Catholic Church calls “Sacred Tradition” - as having the same authority as Scripture. We read John 6 and Matthew, Mark, and Luke, as well as 1 Corinthians 11, and take Christ very, very literally when he says “This is My body and this is My blood” at the Last Supper.The Catechism of the Catholic Church is available for free on the Vatican’s website at: vatican.va/archive/ENG0015/_INDEX. For Catholics, not only is the Bible important, but the things Christians taught after the Bible was written are also important because, we assume, Christ gave us one way to follow Him - one Truth. We believe that, in context, Christ than that bread is now His flesh, and that wine is now His blood.
Both parties must agree to raise the children Catholic and have them baptized as soon as possible (under pain of mortal sin).