[quote="Used2beSherryG, post:5, topic:320210"]
The very first one I thought of is Dr. Scott Hahn who was a Presbyterian minister and is now a devout Catholic. He is a very prolific writer and has many books out there today. I am not too sure if he had many prior to his conversion, but I'd guess that he probably did. I know some famous Catholic writers, like Dean Koontz but I don't know if he is a convert, etc. Any books published bashing the faith prior to conversion would be an excellent witness to the power of the Holy Spirit and how we are all blind and can only see the truth clearly through the powerful messages from God. The humility of Scott Hahn in sublimating his own ego and pride to the will of God is a most powerful witness to all.
And here I was expecting you had a few big names in mind with titles to their "credit" attacking Catholicism published before they saw the light about the errors of Protestantism.
That being said, I likewise admire Scott Hahn for his willingness to follow Christ wherever he brought him. :)