Why Were People Killed In Concentration Camps During The Holocaust?

Because they were jewish and Hitler hated the Jewish people which didn't make sense because, the Jew's were and are the most religious, kind-hearted people i know.
(Please note- I am not religious at all).

6 million is the generally accepted total for the number of jews were killed in the Holocaust including deaths from starvation, disease and of course, mass open air-shootings.

Because hitler hated religious people and jews are religious

12 million people were killed at these camps

Hitler wanted to have the perfect race with blond people and blue eyes. He thought that Jewish people weren't part of the perfect race. He also blamed the Jews for there economic problems that Germany had after WWI to the Jews. Which is wrong because Hitler didn't have blond hair or blue eyes.

People were killed because of the anti-semitism (not sure how to spell that) and hatred Hitler had against the Jews.  As said above, Hitler also blamed Jews  for the poor economic conditions in Germany. Many Jew's were sucessful, and Hitler convinced other's that the economy was failing because the Jew's were taking the money, the job's, etc.