Would you elaborate?
When it is the catholic who should question their own texts.
As an example....from the catholic encyclopedia online regarding the false teaching of the Immaculate Conception:
No direct or categorical and stringent proof of the dogma can be brought forward from Scripture. But the first scriptural passage which contains the promise of the redemption, mentions also the Mother of the Redeemer. The sentence against the first parents was accompanied by the Earliest Gospel ( Proto-evangelium ), which put enmity between the serpent and the woman : "and I will put enmity between thee and the woman and her seed; she (he) shall crush thy head and thou shalt lie in wait for her (his) heel" ( Genesis 3:15 ). The translation "she" of the Vulgate is interpretative; it originated after the fourth century, and cannot be defended critically.
http://www.catholic.org/encyclopedia/view.php?id=6056
St. Paul writes, in Romans 3:28 “For we hold that a person is justified by faith apart from works prescribed by the law.”
This is the verse to which Luther added the word “alone” after the word faith in his German translation. There is simply no basis in the Greek text for this translation and the addition seems arbitrary, if not intentional, to bolster his novel doctrine of sola fide.