I have not read all the postings, so forgive me if this is covered territory already.
A quick point re scripture. Both Catholics and Protestants have sound arguments as to the books included in the OT. If you go to your neighborhood synagogue, you will find that the Hebrew Bible is the same as the Protestant OT. Many old Protestant Bibles (one of my hobby is collecting such) contains the seven additional books as the Apocrypha between the OT and NT. By the way, I believe St. Jerome did not think these apocryphal books belonged in the canon. But the argument is unimportant - to me, at least. It has become part of sectarian claptrap.
Now, I am typical of millions of both Protestants and Catholics. I do not accept all the doctrines and practices of Catholicism, such as transubstantiation and various Marian dogmae, including the Immaculate Conception and Assumption. Why isn't Mary mentioned even once in the epistles of Paul if veneration of her is so central to our faith? At the same time I am definitely not sola scriptura. There is considerable myth, legend, nationalistic propaganda, and false data in the Bible. At the same time I read the Bible regularly for inspiration and spiritual insight.
This is much too broad a subject than can be covered here, but I recall having trouble with Adam and Eve, Noah and the Flood, the Tower of Babel, etc., as a young teenager. They simply are contradicted by history, science and common sense. And consider the notion that Moses wrote the five five books of the OT. In those books Moses is described as 'the meekest man who ever lived" and his death and burial are recorded in Deuteronomy. And so much more. Who out there believes that our loving God commanded Joshua to slaughter every inhabitant of such cities as Jericho and Ai, and ordered Saul to slay every Amalekite? How can that be made compatible with the Ten Commandments or the Sermon on the Mount? What about the admonition "suffer not a witch to live" and Biblical endorsements of slavery? What about certain barbaric 'laws' in Ex. 21, Lev. 20, and Deut. 22-23? Etc.
There is much about Catholicism I admire, especially its commitment to the poor, its founding of many fine universities, its many fine hospitals, etc. However, in good faith I cannot accept some of its theological teachings. This will be dismissed by many, of course, as my pride, but so be it. It is my honesty, integrity, and conclusion after years of study and thought. Catholicism is simply too 'pagan' (sorry to use that word) for me, borrowing too much from the culture of its early years. I can't imagine Christ being at home in resplendent Catholic churches with their elaborate vestments and liturgical legalism. And some of the miracle stories re saints, even modern ones like Padre Pio, are wildly unbelievable.
But, I also cannot subscribe to that variety of Protestantism which embraces sola scriptura, as there is much in scripture that must be dismissed as extra-Christian, even anti-Christian. My faith is built on the gospel of Christ, well summed up in his Sermon on the Mount. Beyond that I can live in awe before the mysteries of this huge universe.
God bless Catholics, Protestants, Orthodox and people of all faith who love God and seek to serve him through serving humankind. May religion cease to be a barrier and become a bridge, helping our war-weary, hate-filled world move toward peace and mutual respect.