You know, it's funny. I know so many Catholics who were raised Protestant like I was, who later became Catholic because that is where they felt the Lord calling them to be, and I've yet to find one who really attacks their old denomination. Most remember it fondly, I frequently hear from one of my friends who was raised Southern Baptist how grateful he is that he was encouraged to read the Scriptures daily and how much he enjoys it. I hear from another friend who was raised Presbyterian who reminisces fondly over how his old church would work closely with the homeless and how it made him really appreciate the gifts he'd been given. In my own example I look at my grandmother's example, a devout Baptist, who always has supported me and told me to talk to Jesus whenever I have problems. She was always unafraid to practice her faith, even in public. She never pushed her faith, but she never hid it either, and I try hard to emulate her.
For me, I came to the Catholic Church because of it's devotion to Scripture, and most especially it's devotion to Jesus. Everything the Church teaches is focused on Jesus, or is a reflection of Jesus. We emulate the saints because they are examples of how a human can follow Jesus in a way we an appreciate. We accept Jesus into our hearts, we also accept His mother as our own. We trust in the promises of the Scriptures which tells us that Abraham, Isaac, Jacob (and implies that there are more) are not dead, but alive in Christ. We know from Paul's writings that our brothers and sisters in Christ who enter into glory are still aware of us and cheer us on, so we ask them to pray for us.
I find it sad that there are still so many who rail against a false vision of what the Catholic Church teaches. But I know that it is possible to come out of that snare of deception that the devil uses to pit Christians against each other. I too at one time railed against "romanism" and tried desperately to save my Catholic friends, but in the end, they saved me. May this Christmas season see the Lord come and deliver you from the false snares the devil has laid out to deceive you and show you that we Catholics are your brothers and sisters in Christ and that we love you.