however christian doctrine does not call for kuffars to be beheaded. Quran does.
Oh, c'mon, have you ever read the Old Testament?! It's very violent, just as violent and intolerant as the Koran. They both came out of the same place and mentality. Stoning?! An eye for an eye (literally!)? Abraham and his son?!
There are committed Christians insulting the parents and bodies of dead American soldiers coming home, in the name of their god - they have a whole sect built around it. And didn't something happen at Waco?!
I agree, their are islamist countries that still have a middle ages mentality (but not all), but let's not forget that Christians in the middle ages were pretty much the same! But plenty of muslim-origin countries are not like that, just as plenty of christian origin states in the USA are fine with gay rights. But on the scale of Christian fundamentalism, you ahve to admit that Poland is one of the more extreme, or a par with Turkey or Morocco.
Sharia is indeed intolerant, but so is the Polish Catholic Church. Depending on who you are, there is absolutely no difference between them. If you're not fully signed up, then both of them persecute you and there are freedoms that you are not allowed whether you are in Saudi or Szczecin. Maybe not to the same extent, but with the same agenda of not accepting you as a full member of society.