I don't know what plaque you could possibly be talking about at Auschwitz-Birkenau. The Nazi numbers have been steady at 1 million or so deaths there in documents and accounts. 1 million people out of 5 or 6 million died there alone.
There's evidence of the gas chambers being used to kill people. There have been eyewitnesses and confessions, from Nazis themselves, of the horrors of the gas chamber, what it looked like to clean the bodies out, the crushed people at the bottm, and asphyxiated mass struggling for the air that zyclon B takes away. You're right, it was a pesticide, used for typhoid outbreaks. But that's the thing: it was inexpensive and readily available, so when the chambers went into full use, they already had their killer.
There's piles upon piles of gassed people's golden tooth fillings, glasses, hair, shoes and hats, collected for resale. All from gas chambers. I don't know where you get off saying there wasn't any evidence for gas chambers...
So many eyewitness accounts, or people who lived through it, of people who admitted to it. Once off the train, you were selected into two lines, one to be gassed, another to work. You know where some people worked? Cleaning out the gas chambers...
There's evidence of mass graves:
http://cache.eb.com/eb/image?id=67845&rendTypeId=4
http://media.commercialappeal.com/mca/content/img/photos/2007/09/13/16genocide1.jpeg
http://z.about.com/d/history1900s/1/0/d/8/einsatz7.jpg
Oh, and the prisoners simply weren't fed. "Of course they're going to be malnourished". Yeah? the SS seemed pretty healthy.
http://z.about.com/d/history1900s/1/0/P/C/dead10.jpg
http://z.about.com/d/history1900s/1/0/N/C/dead13.jpg
That's because 6 million people weren't burned. The crematoriums were among the first things that the Nazis destroyed when the fight was lost, to destroy evidence. Then again, the Auschwitz-Birkenau complex was able to get rid of a million people in a few years, that's plenty for everyone else to pitch in 3 or more million, the rest buried or left for dead wherever they fell.
Oh, and I lived in France most of my life, and my professors have written books on this. I've spoken to plenty of people who were there. I've been to the museums, the graves. I know what I'm talking about.
The numbers of dead varies, some exaggerated, some underreported. But come on dude.
