Do you know that there are many Christians cutting across all denominations that do not know much about scripture? Same way, I believe there are people who call themselves RCC members, who do not know or understand the teachings of the Church. From what I have seen you post here, it seems to me that perhaps, you fall under this group when you were their member. Some in this group strive to know, even when they stopped being members, others run with what they have imagined in their thought to be the doctrine and practices of the Church whilst basing their judgment on perceptions or appearances alone. They end up misrepresenting or even maligning the Church.
Whose truth? Truth according to whose interpretation of the bible? Some school of Thoughts have said, which I agree with, that if the Reformists or is it Reformers were right, there would have been only two Christian denominations. Today the proliferation of denominations reveals how wrong these reformers were. Today, everyone has a different interpretation and run with it as the truth of the gospel just like in the church of Corinthians of old. (1 Corinthians 14:26).
Thank God, the holy Spirit guides the saints today and God knows who are his. These people of God cut across all denominations, and even all religions. It is not by appearance as we know God judges the heart.