I was raised Lutheran and my early attitude toward Catholicism was heavily influenced by the pastor who confirmed me. He was a virulent anti-Catholic and made sure that we believed that the Catholic Church was the right arm of the devil. That colored my impression of the Catholic Church for quite a few years.
In college I studied music and, in a music history class part of our study of early music was church music and, particularly the Mass as it developed. When I first read the translation of the Ordinary of the Latin Mass, I was amazed that it was identical to what we used in the Lutheran church.
Going ahead a number of years, when our oldest daughter was ready to enter kindergarten my wife was not impressed with the local public school and, one day, asked me what I would think about sending our daughter to the local parochial school. She explained that she thought it would be best to send our daughter to a school where there would be a serious Christian influence. I sort of took a deep breath and said something like “if you think it’s the best way to go I guess we can do it.”
Eventually, all three of our daughters went to the same school and thrived there. They are all still Lutherans but they benefited greatly from their Catholic education. I do remember, though, trying to discourage them from saying the “Hail Mary” when they said their bedtime prayers.
Further on, there came from our oldest daughter, then a student at Lenoir-Rhyne College (a Lutheran college in Hickory, NC) a brochure for what was called the Aquinas-Luther Conference held at the college. My wife and I attended and were impressed by the speakers and the commitment of the conference to increase understanding between Lutherans and Catholics. This led to my doing some fairly extensive reading about Catholicism and, as a result, coming to have a very positive view of Catholicism even if I don’t agree with every jot and tittle of Catholic doctrine.
That a brief history of my journey from being somewhat anti-Catholic (I never quite believed all the horrible things my pastor told us in confirmation class) to one who is happy to recognize Catholics as my brothers and sisters in Christ.