The complete absence of any valid evidence. Sorry folks, your "holy" book is not evidence. You can quote away on your verses, but alas, they do not mean anything. It is a book. Whether its the Book of Mormon, the christian Bible, the Quran or the Egyptian Book of the Dead, it belongs in the mythology shelf. Since there is no religion that can provide a single shred of evidence that their book comes from any kind of omnipotent super-being, it is no more valid than my copy of Forrest Gump. "Oh, but the Bible says the Christian god is real!". Really? The Quran says the same about Allah and the Book of Mormon says the same about Joseph Smith. This is circular reasoning, which is a logical fallacy. Get over it.
"Look at the world around you! The mountains, the rivers, the trees and the grass! This is evidence of God!". Sorry folks, wrong again. Someone in the comments section, I can't remember who, used this argument. He said that if he showed you a house and told you a builder built it, it would be sound reasoning to believe that it was in fact a builder and that this applied to the world and God. This too is a logical fallacy. I have a Lego piece in my pocket. An alien gave it to me. Don't believe me? I'll upload a photo of the Lego on Facebook so I can prove that aliens who give out Legos exist. Suddenly that form of reasoning doesn't sound so logical, does it?
"God does exist! Science can't prove that he doesn't! Prove to me that God does not exist!". Again, another logical fallacy. There is a mermaid swimming around in an ocean under the ice of a planet orbit a star in the galaxy Andromeda. For real. You can't prove me wrong, so it must be true. Understand? If you claim there is a leprechaun stealing your sister's underwear, then it is your job to prove it, not mine. The same applies to you claiming there is a god who created the universe. That's the bottom line.
To sum it all up, religions do not have any evidence to show one how one "holy" book is more valid than another, they do not have any evidence to support a creator and they do not have any evidence to back up their claims of a god of any kind even existing, therefore, religions are irrelevant.
Which brings the discussion to the atheists: seeming that we all know that religions are irrelevant, why are you all wasting your time on them? They are so hopelessly indoctrinated into the baloney they believe, there is no reasoning with them. You can demand "empirical, verifiable evidence" over and over and over (I'm talking to you, Siebert), but you're not going to get any evidence, so why are you all still trying?
Focus on the mission at hand. We want religions to stop trying to convert us, we want religions out of law making, we want religions out of schools and we want religions to respect our right to not believe in their rubbish. We are half way there. Religions are out of law-making. We live in a secular country. Mission successful. Religions are out of schools. Religious practices in government educational facilities have mandatory voluntary rules in place and any form of preaching against a child's will is illegal. Mission successful. All that remains now is for religious people to learn to respect our right to not believe. This is a very difficult task, but it is not impossible.
Christians, for example, are very careful not to offend Muslims, Hindus and others, but they give no second thought about offending atheists. This, friends, is where we should focus our priorities. Telling them what to believe is just as bad as them telling you what to believe. It annoys you, it annoys them, it is pointless and it is stupid and even trying to reason with them is as effective as farting against a hurricane, purely because of the moral high-ground they seem to think is theirs, because you know, "I'm a Christian". Don't give them any attention. Don't engage with them. All you're achieving is making them feel like their petty beliefs are worth your time and this feeds them status. This is very counter-productive.
What we need to do is make our presence known. Somehow devise a way to become organized. Numbers matter. The more atheists come out and assert themselves, the more closet atheists will come out and follow. The only thing religions seem to leave alone is other religions. We should use that. As stupid as this sounds, we should start the Atheist Religion. People from the religion called Atheism find getting called sinners very offensive and its time religious people learn that. How about we teach them some tolerance?