This is so bizarre to me. I like coming here and running into people who believe strange things, and trying to figure them out, but this is my first foray into Holocaust denial, and I must say I find it very strange. Therefore, please forgive me if my questions aren't as clear as they could be.
As for the gas chambers, there are two ways to address your question about why the gas chambers matter. One way is to note that they really don't. Even if there were no gas chambers there would be mass executions by bullets, and gas vans, and starvation, and lots and lots of just plain old hangings of innocent people. The gas chambers were just one way out of many that Jews and others were killed, so even if it turns out that the gas chambers were false, the Nazis would still have lots and lots of evil left over.
However, I don't think that's the best answer. I think a better way to address the question would be to note that the evidence for the existence of the gas chambers is so incredibly overwhelming that the only way they could NOT exist would be if there were a massive, incredible, and well orchestrated conspiracy to fabricate evidence of their existence. Furthermore, the conspirators would have to maintain their silence and stick to their stories for their entire lives, (some of which ended on a rope shortly after the end of the war, without recanting the confessions) without a crack in their armor. So, yes, it would be a big deal to find out the gas chambers did not exist, because it would be proof of some amazing secret society that manipulated the governments of the world, the media, and every other element of society.
I always wondered why such groups stay in the shadows. With that kind of power, you would think they wouldn't mind coming out. Who is going to stop them? They control every group that could get in their way?
I don't know what it was that you found compelling in the arguments against the existence of the gas chambers, but whatever it was, you've been duped. They really existed.