Regardless of the definitions agnostic vs. gnostic, theist vs. atheist, I personally believe that organized religion is one of the most negative and detrimental forces ever designed by humankind, responsible for dozens of millions of killings throughout history, and still today. Sure, there are other forces that are anti-religion and incurred in even more killings (one thinks of the Stalin regime, for example), but that doesn't exempt organized religion from all the damage it has done to humankind. I didn't say it is *the* most negative and detrimental force. I said it is *one* of the most negative and detrimental forces, in my opinion. I'm saying "in my opinion" to be nice, but I do see it as quite factual, since religious-based wars and violence are factual and can't be denied, from the crusades to modern terrorism. "My God is better than your god therefore I must kill you" is one of the oldest forms of violence ever invented by our species. Religion is also a force that hinders progress and sets back scientific pursuits (for example, stem cell research). We are in the 21st century; it's high time to put these superstitions aside.
Does God exist? I don't know and don't care (his existence or lack thereof certainly doesn't directly affect my life, my morals, my goals, or my happiness). I think we humans should stop focusing on these fairy tales, and start trying to get along.