While I'm not in any way qualified to help with this, I would offer this advice, never go deeper than two posts. People like this will rarely listen to reason or established fact due to their own personal ideology or beliefs. The best thing to do is never feed the trolls, even if they're not trolls. You nor we will be able to change this person's mind, I've read some of their posts and it was depressing.

When it comes to these types of people, it's better to just drop it and let them refuse to accept the truth. They ignore the sun in favor of the shadows on the cave wall.

I'm sorry, but while I sympathize, we can't have a post that directly requests people to go into another thread and start responding to someone, as it goes against the site-wide rules of Reddit.

There is nothing wrong with people providing you with some good information which you then utilize, but you can't ask them to do it all for you. Could you please remove the last line of your post? I'll restore it once you have.

Also, you don't really need to wait, since we have some entries in the FAQ on the topic.

People like him see arguments and facts only as some kind of decoration for their preconceptions. Don't waste your time.

On the other hand if you yourself are interested in how we know there was a holocaust, this might help you: http://www.reddit.com/r/AskHistorians/wiki/wwii#wiki_holocaust_denial