Over the course of the years religion has done more harm than good. When people claim that religion is what gives people morals, they indirectly claim that atheists have no morals. Hmm, I've met atheists who got more morals than I've ever seen in religious people. Some of them even claiming that the reason they chose to reject religion altogether. Claiming religion is what brought us morals can therefore be seen as a direct insult to a large group of people.
Now "God wants it" or any variant of that phrase is one of the most abused excuses to justify the most horrible things, over the entire course of human history. That is unfortunately a fact. The reason the city of Jerusalem has seldom known peace is because multiple religions clash over to whom the city belongs and due to some of the holiest things of the specific religions being located there. I'm not gonna debate about who's right or wrong. I'll just stick to the facts.
In Dutch history, the 80 years war was the result of people having a different opinion about religion and became protestants. King Philip II, didn't agree with that and sent the Spanish army to kill those heretics, and make sure the Roman Catholic church would remain in power there. If you know the horrors that took place because of that, you can't speak of morals. Burning an entire city not caring about who was catholic and who was a "heretic" and just stating "God will pick out his own"... Yikes.
Yet I've seen some good sides of the church too. When there are a shoot-out in a mall in the Dutch city of Alphen-aan-de-Rijn, the church played a big role in helping people getting over the shock about what happened and unifying people.
Now I am not so naive to think that without religion we'll have a better world. People want to hate for hatred's sake. "We" are "good" and "they" are "evil". With different religions, we can easily for a "we" and "they", and fight each other both saying: "God is at our side". If religion never existed people would have found other reasons to hate each other for and to form the "we" and the "they" and to me the "we" the "good" and the "they" the "bad". The fact that religion unifies is its power and at the same time its weakness. Same goes for nationality, sports and other things. Religion also tries to debunk things scientifically proven, which is also a bit spooky. So personally I am not fond of religion, but I do know that many of its bad sides may have gone to other things if it didn't exist.