As it is one of the most important and influential masterpieces in the history of the social science, if you can understand the analytical methods used in this book, the rest is few. Since even the details are interesting, I stress the structure of this book.
The first part is the proposal of the question. Found on several statistical analysis, the following problem is arisen; why merchants and manufactures were willing to be protestant, which has the much severer attitude to desires in the world than Catholic?
The reason is the estimation of the job. Their preference is bound to their social situation in the Middle. This is the fundamental leading discipline of Weber.
The second part is the results of such Protestantism. They willingly entered them, which obligate their work as sacred. Then, what happened as results? The main influence is brought by the predetermined dogma, which means that the fatal of people has already been determined before their birth. It makes people disinterruptedly anxious and stress, because nothing to do is useful for the salvation in this world. Its psychology became the engine for the world to be free from the magic.
His existential analysis of Protestantism attracts readers even now and we applause it, but in his eyes their psychology was bound by their social situations. His analysis seems to stress the psychological change at the second stage to have believed in them, but he shows the importance of the motivation at the first stage to have entered into them.
This overview may make clear the composition of his analysis. However, maybe, almost all readers will forget this framework in the face of his analysis' seriosity.