Language / -ski/-ska, -scy/ski, -wicz - Polish surnames help [185]

I know that if you're a guy you are -ski, a girl you are -ska and if you're married you're -scy/sky

But what rules apply to -ewicz ?

Dziekuje.
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Language / in Polish slang, what is the difference between Siema and Siemka? [64]

I'm learning Polish and I talk to polish friends online, i'm just wondering what context to use Siema and Siemka in.

One of my polish friends said 'siemka' is diminutive or something, but i dont know what that means :S haha

Dzieki
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Life / Is Poland split into two religions: catholicism and non-believers? [103]

can somebody describe to me the Polish religions intact in Poland at the moment.
Some people have said the country is split into 2, catholicism and non believers.
If this is true, can somebody post a picture or something showing which sides which, or maybe paste an article (in english) about it?
Thanks xD