James Chapter 2
There are good answers here, and I know that this post is old, but I feel that there should be more emphasis here on the teachings from James 2:14-26 because, as I understand it, this is the central passage showing specifically what is being asked in this question, that faith causes good works. Reading the quotes you placed, I suspect that they were most heavily inspired by this passage.
The general message of James
I believe that the passage itself would be a familiar one to most Christians, but to put it into perspective, first consider the book and how it is taught. I have heard the specific book referred to in a group of books known to some Protestants as the "Reality Epistles", including, for instance, the general epistles of Peter and John. The purpose of these Epistles is to help the audience to determine whether their salvation is genuine. Even more so than the others, the general aim of the Epistle of James is to show that the ways that we live our daily life are reflective of whether or not the things we say or want to believe about ourselves is in fact in harmony with reality. Throughout the book James uses many examples, including the way that we pray, the ways that we talk, and how we treat other people. In all of these other areas, James isn't trying to just show us that we should try to do better, but specifically that we can see with hard proof that what we say is not true. If we pray and don't accept God's answer, we're not really praying. If we judge people by their status, we don't really believe that all people are equal before God. He gives a clear picture for the tongue:
James 3:12 - Can the fig tree, my brethren, bear olive berries? either a vine, figs? so can no fountain both yield salt water and fresh.
If we hurt people with our words, it's not that we didn't hold our tongue, but that we aren't really clean inside our heart. We can't just try to say better things and be okay any more than a fig tree just work harder at bearing olives. Either you are a new creature or you are not.
James 2 within that context
So, can this type of thought be applied to the end of chapter 2 as Protestants teach? The most clear verse is 2:18:
Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.
Note that the man without works can only "say" that he has faith. However, if one has faith, that fact can be shown by his works. The Greek word we translate faith is "πίστις", from "πείθω" meaning "to be persuaded". Faith is never given in the Greek as being simply a mental creed or statement which simply checks off or agrees to something, but it is something of which you are actually persuaded. If I said that I believed the building is on fire and didn't leave, the problem isn't that I was just lazy but that I wasn't actually persuaded that it was true. We always act on what we actually believe.
What are the "good works" of James 2? He doesn't have to say them explicitly because they are simply the "works" spelled out in the rest of the book. They are things such as rejoicing when trouble comes, praying to God sincerely, not mistaking God as a tempter, obeying the Bible, don't treat certain people differently, don't speak hurtful, negative things, don't be proud, etc. These are all things that, if we truly are persuaded of the truth of Christ and the Bible, we would simply be doing. If we are not doing them, the problem isn't that we're lazy, but that we aren't truly persuaded.
Note the verses 21 and 22:
James 2:21-22 (emphasis mine): Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar? Seest thou how faith wrought with his works, and by works was faith made perfect?
James must clearly be pointing out an integral connection between faith and works, such that if works didn't happen, then the faith would either not exist in truth or the faith would have no effect. If you were to read James by itself, and you failed to catch the rest of the context from the book, you might be tempted to accept the later, that James might be talking about there being a faith that could exist which could be both real and would have no benefit. However, that concept would not be available for most Protestants as they believe that all Scripture is equally as authoritative and in harmony with each other, and so they would be forced to consider the works of Paul.
Compared with the writings of Paul
Much of the writings of Paul deal with the same topic, that salvation is not simply a creed or birthright, but instead it is a wholly new nature, and one which has some tangible differences from the old nature, using the term "born again". I would expect that every Protestant is familiar with Ephesians 2:8-10 (emphasis mine):
For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast. For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
Paul is very clear that works is not any part of salvation, but faith is. Works are something that happen after salvation. Therefore, if both passages are equally true and speaking of the same salvation, one which occurs by faith without any works being a part of it, and if faith without works is useless, then I think the only natural understanding of the text of James is that faith which does not produce works is not actually faith at all, just as a fig tree is not an olive tree at all, regardless of how many olives are on it or not at a given moment. Nevertheless, if it were an olive tree, then the only fruit to grow on it, in time, would be olives.
The Protestant perspective
The Protestant perspective is that what people do is reflective of what they believe. Protestants doctrine teaches that salvation is something that is done by God and for God, in spite of the sinfulness of the men He saves, and that this change is something which is not simply a matter of doctrinal agreement, church membership, or recognition by some other human, but it is a real change of a person's nature, and that change involves faith, which is actually being persuaded of the truth of Jesus' teachings and the Bible. Hebrews chapter 11 is called "The Hall of Faith" and in all the teachings about faith, it is all records of people who believed what God said and who acted as if it were true even though it did not make any sense, and even though the reward was not in this life. It shouldn't be hard to see how anybody so persuaded, who believes that the Bible is authoritative and consistent, would see passages such as James 2:14-26 as clearly stating the causal nature of faith to works.