Believe it or not, Catholics have heard these objections before, and they've all been answered.
If you want to change the hearts of Catholics, you will have to inform yourself regarding these issues.
Some resources:
Catechism of the Catholic Church
Summa Theologica
Church Fathers
Catholic Encyclopedia
Catholic Answers
Scripture Catholic
Biblical Evidence for Catholicism
Why not just read the Bible? God will change the hearts of Catholics or any other denominational worshiper, (by that I mean those who worship their denomination).