You could say the same thing about everything. Organized religion has it's flaws and it has it's positives just like almost everything else on this earth.

Reply to italic: Sort of. It's an argument that makes it easy to believe God doesn't exist because it sounds ridiculous how something could exist without complying with the laws of nature. But on the other hand, how can you comply with the laws of nature when you're the one who created them in the first place? In that light, it only makes sense not to comply with the laws of nature. How do you counter such an argument without resorting to some sort of a belief yourself? I don't think you can. It all comes down to believing that the existence of God is unlikely all things considered. I don't think it's possible to prove, without any doubt, that God doesn't exist, because their very nature is such that it's not possible to conclude anything about them unless they decide to reveal themselves voluntarily.

None of those three dictators believed in the existence of unicorns, hence the lack of belief in unicorns causes people to commit atrocities.

The connection you made is contrived. False cause.

If you could name a nation that adhered to science and rational humanism that committed these atrocites, then you would have something.

Like Rol said, I don't think anyone (at least anyone you can take seriously) is implying that there wouldn't be wars without religions. It's just that religion gives a relatively easy reason to start wars, and having less reasons to choose from for going to war would obviously make going to war more difficult. As a concrete example, do you think we'd have so much terrorism without religions? I don't think we would, and I don't think we'd have an equal (or greater) amount of more traditional warfare either to replace terrorism.

I could say the same thing about governments, dictators, socialism/communism, any militant with access to gun or a silver tongue. All these institutions are involved in executions, assassinations, genocides, murder of thousands for land, 6 million jews in Germany with Nazis, pick a country in the middle east, Assad or whoever the flavor of the month is, yeah let's elect a dictator, know who dictators hate and silence? Religion. So when you have Castro doing all that good in Cuba, you can pick a genocide over the years and relate it back to someone elected.  All these all happened recently, when we are more "civilizied' and less religious, and yet these continue happening to this day in places with no Christanity.   Don't worry about the Crusades 1000+ years ago and just ignore the causes of it.

And if the world is getting less religious (hilarious that you pick Catholics who do the most charity and help the poor regardless of race) than we should be seeing less crime and death and hatred right? Let me go check the news and see how much better things are...whoops guess not, crime is up, rapes, mass murders, how's the great progressive Obama doing these past 7 years, oh that bad. Maybe the further we get from religion the worse things will get as people abandon basic morals and values that Christianity teaches.

How do you feel about Islam, which seems to be the religion most associated with violence these days?

Uuuuhhhh....what?

First. Yes, we do know how gravity works...The valley between religion and science is huge. The easiest way I know of to describe the difference between the two is this. 

Religion is about giving answers, Science is about asking questions.

For the second bold part. Being for equallity doesn't mean that everyone is to be protected from criticism. Espeically when you often find people trying to use religion as the basis for legal systems. It's hard to make the case for "Don't hassle me about my religion! Oh, but my religous doctorine should be the law of the land."

Or any other "insert excuse to kill here". People are evil because they are evil, and they will always find their pretense be it in religion, politics, enicity or just about anything. Religion is not the problem, human nature is.

It also took longer for cities to get street lights (they said god made the day and night, we can't mess with that), lightninrods (we can't oppose to god's fury) and tons of other stuff all because of religion.

Religion is not the problem; the religious extremists who distort religious scripture and ideas are the problem. Unfortunately, these people are often mistaken as being representative of an entire religious group because of their exposure in the media and other outlets. Every group, religious or otherwise, contains irresponsible members. But should we castigate these groups based on the actions of a few?

Should we ban alcohol because some people misuse it? Drink responsibly. Believe responsibly.