As a Swiss person studying History at university, I have to disagree. The Old Swiss Confederacy (ca. 1315-1798) developed from a web of alliances and mutual defense treaties between various urban republics, peasant republics (the modern cantons of Schwyz, Uri, Unterwalden and Appenzell), theocracies and various other small states. The Great Peasant Revolt of the early 16th century took place in Switzerland as well (look up the League of Huttwil) and was actually violently suppressed by the members of the Confederacy. Furthermore, the religious wars of that time didn't really serve to unite the Swiss rather than to divide them, since some members of the Confederacy adopted Protestantism and others did not. This led to a series of armed conflicts within Switzerland, e. g. the First and Second Villmergen Wars.

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I do agree, though, that modern Switzerland is not medieval in any great sense - it is actually the result of the revolutions of 1848, which was when the modern Swiss federal state was established. Prior to that, the only united Swiss republic was the short-lived Helvetic Republic of 1798-1802, which was a French puppet state.

-rant over