PRESBYTERIAN THOUGHTS has become all the rage amongst the Roman Catholic Church. I think that when the Gospel is presented with clarity and the truths of the Protestant Reformation are show to be experiential as well as scholastic- people listen!
An Examination of Roman Catholicism is worth the read for anyone who is working through issues regarding the Catholic Church.
(Heidelberg Catechism) Question 80. What difference is there between the Lord's supper and the popish mass?
Answer: The Lord's supper testifies to us, that we have a full pardon of all sin by the only sacrifice of Jesus Christ, which he himself has once accomplished on the cross; and, that we by the Holy Ghost are ingrafted into Christ, who, according to his human nature is now not on earth, but in heaven, at the right hand of God his Father, and will there be worshipped by us. But the mass teaches, that the living and dead have not the pardon of sins through the sufferings of Christ, unless Christ is also daily offered for them by the priests; and further, that Christ is bodily under the form of bread and wine, and therefore is to be worshipped in them; so that the mass, at bottom, is nothing else than a denial of the one sacrifice and sufferings of Jesus Christ, and an accursed idolatry.