You have access to the internet, use it. How can you be sure? On march 13, 1942 Quisling (who you may have heard of) reinstated (!) the "Jew paragaraph" in our constitution. It denied all jews permission to be in Norway. Subsequently all jews (those that did not escape) were deported to Auschwitz. Of 767 jews only 27 survived. These are well documented facts that all norwegian historians hold as true. In my town it is a well-known fact that the store of a jewish family (Plesansky) was confiscated and given to a nazi-friendly competitor. The Plesansky family was deported, and only one survived. I remember my grandmother shaking her head and, with pain in her voice, saying: "Oh, that poor little jewish girl," referring to a young girl that was deported (possibly Mina Plesansky). Most witnesses are dead now, but if you are honest and want the truth, the Holocaust is one of the best documented facts of history. So the question is: Why don't you want to believe?
12 Iraqi troops, militiamen killed in multiple ISIS suicide attacks (AP)
from the article: Poll: Over 25% of Israeli Arabs say Holocaust never happened