Man you are dense. The reason I mentioned Octoberfest and the sport events was to explain you that it has nothing to do with the holiday or festival being christian or not but about it being famous enough to be recognized globally. You know the Brazil Carnival? probably you do, that's the reason why you have the carnival line and part of the masquerade but please tell me how is that also christian related.
And while you are at it please tell me again how leprechaun and four-leaves cloves are christian, and how hearts and chocolates relates as well? The reason why you see all the holiday as "christian" is because the christian incorporated all the existing holidays onto their own so people will identify with them and join the new religion, as a result not even one of the christian 'holidays' are truly christian but most of them are recognized globally. Even Christmas is set on December because of the winter solstice festival, the actual nativity was probably around April or March instead.
Riot doesn't support any religion holiday but global events because if people can recognize it easily chances are they will buy it, I can say with confident that 70% of the people don't know the real reason to celebrate Saint Patrick Day or his importance, but pretty much every single one of them will wear green that day. You probably don't know who Saint Valentine was but still you buy chocolates for your gf in December weather you are on the US or you are in a budist country like Japan or Nepal. If riot was doing religion related skins you woudl see crosses and jesus and every skin of that line, instead you see the commercialized symbols like pine trees, hearts and four-leaves cloves.
Now go and shout at your local grocery store that the Christmas decoration they have on is insulting to you since you don't celebrate Christmas and pass on your tolerance onto people. (Btw funny how you didn't mention anything about the Chinese new year, which is probably chirstian too lol)