Prayer and fasting with large doses of biblical truth are the most effective tools to rescue Catholics.
We have had a Catholic visitor come every week to worship for the past two months ... two weeks ago during the presentation of the gospel (we take 10-15 mins every week to present the gospel), she got up out of her seat, stood and publicly proclaimed, "I repent ... Jesus Christ is Lord." ...
She was baptized in a hot tube after worship yesterday in front of the church ... members of her Catholic family witnessed it. She gave her testimony before her dunking ... she mentioned that when confronted with the truth of scripture her eyes were opened.
Since the Gospel is read in Catholic services, there is the hope that some may turn as it is the power of God. Despite the rest of the teaching, not because of it.