Here is are some samples from
Pugio Fidei
1. Do not allege that there are 33,000 Protestant denominations. This tally comes from the 2001 World Christian Encyclopedia, and it includes all denominations and paradenominations which self-identify as Christian, including Catholics, Orthodox, Protestants, Old Catholics, Mormons, Jehovah's Witnesses, Seventh Day Adventists, Gnostics, Bogomils, etc. And even so, the number is too high. The World Christian Encyclopedia artificially inflates the number of Catholic "denominations" by counting Eastern Churches in communion with Rome as separate denominations. It likewise inflates the number of Eastern Orthodox "denominations" by counting Churches in communion with each other as distinct.
This reference lists 8,973 denominations under the heading "Protestant," and 22,146 more under the heading "Independent." Some, but not all, of the "independent" denominations may justly be described as Protestant. Still, these numbers may be inflated similarly to the numbers for Catholics and Orthodox. Suffice it to say that there are thousands of Protestant denominations.
Moreover, even if we could arrive at an accurate tally for Protestant denominations (20,000?), we still could not blame the whole of that number on Sola Scriptura. Some of these churches share substantial unity in faith, even if they are juridically independent (perhaps due to geography). And much of the disunity of faith within Protestantism, at least in the developed world, stems from efforts to subordinate the authority of Scripture (e.g., to various sexual perversions). In reality, if every Protestant denomination were serious and consistent in affirming and applying the rule of Sola Scriptura, the spectrum of Protestant belief would be significantly narrower. It bears emphasizing: the only thing for which we can directly blame Sola Scriptura is the extent to which it fails to provide unity in true faith and morals to those who sincerely adhere to it, e.g., "orthodox" Lutherans, Presbyterians, Baptists, Anglicans, Methodists, Pentecostals, Campbellites, etc.
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15. Do not cite Ephesians 2:10 against justification by faith alone. This passage, even rightly interpreted, contains nothing inconsistent with Protestant theology. Having been saved by grace through faith, we ought to do the good works which God prepared beforehand for His children to do. This statement does not require that these good works should themselves be salvific, but is consistent with the supposition that these works are merely the necessary outgrowth of a salvation already completed. In order to establish that good works are salvific, the Catholic must look elsewhere.
16. Avoid making hay about Martin Luther adding the word "alone" to Romans 3:28. While the word is indeed absent from the Greek text, Luther was not the first to regard it as a justifiable gloss. That it is not in fact justifiable makes Luther's addition an exegetical error, but this is not the same thing as a blatant perversion.
17. Never ask, if a Protestant believes his salvation is eternally secure, what motivation he has to do good and avoid evil. The answer is obvious (and embarrassing to the Catholic who asked the question): the love of God. The love of God is sufficient motivation to pursue holiness with all vigor, absent any considerations of self interest. The most that a Catholic can argue in this respect is that Catholic theology, which furnishes men with both the baser motive of self interest and the loftier motive of the love of God, is superior in the practical order. For, in many cases, the baser motive will effectually turn a man from evil to good whereas the loftier motive, even though it should have, did not.
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