During the 16th and 17th centuries, there were many religious wars in Europe. In countries, were it was very close to Rome (like Spain, Portugal, Austria, Italian states), they did not occur. In Northern Europe (Scandinavia), were it was far from Rome, or it head also political reasons (the Netherlands), the Protestantism was accepted (relatively) quickly. However, in the "middle" countries, like German states, France, in some part Bohemia and Hungary, and of course England and Scotland, the Reformation was not quickly accepted/rejected, but some wars or fightings occurred.
In Poland (and Lithuania), which is geographically in the same position as Germany, no wars happened. This is somehow strange, as many Polish people were protestant and many Catholic. Sources claim that "Poland was very tolerant", example (WHKMLA):
The majority of Poland's nobility had converted to protestantism. Poland's tolerance policy attracted those who were persecuted because of their confession, from the Netherlands, France, Silesia.
The same is on the official site of Republic of Poland (but this might be a kind of propaganda):
In the 15th and 16th centuries, Poland was a country open to new religious trends. Unlike other European countries, there were no religious wars here. Not only could heterodox religionists find sanctuary here, they were also protected by the kings and lords of Poland. As a result, culture and scholarship experienced an influx of new ideas and literary works, building up an image of Poland as a country of toleration. This was particularly true as regards the Warsaw Compact, ratified in 1573, which gave Protestants equal rights with Catholics. The last Jagiellonian monarch, Zygmunt August (Sigismundus Augustus), said in Sejm, "I do not rule your consciences." Not surprisingly contemporaries and later generations called the Jagiellonian era, especially the 16th century, their Golden Age.
And what would be a post without citing Wikipedia? Here it is:
The 16th century Commonwealth was unique in Europe, because of widespread tolerance, confirmed by the Warsaw Confederation. In 1563, the Brest Bible was published (...). The period of tolerance ended during the reign of King Sigismund III Vasa, who was under strong influence of Piotr Skarga and other Jesuits.
The Sigismundus III Vasa's reign was also strongly influenced by his Swedish claims, and considered protestant rulers of Sweden illegal. This however had no impact on Polish common tolerance policy.
My question is where did this religious tolerance come from? Why were there no fightings in this multi-religion state?
My assumption is that the Commonwealth was since its existence multi-cultural country. There were Polish, Lithuanians, Ukrainians, Germans, Jews etc. There were Catholics, Orthodox and Jews who (probably) made good businesses with one another helping them to find common factors. So when Protestants came, they were just another group of many. Or, referring to "good business", it was just not profitable for anyone