I realize atheism doesn't claim to be a religion. And I'm only referring to those atheists who feel they must convert God-believers to atheism, or else these God-believers will destroy civilization.
There is an intensity of emotion, an anger, an urgency in these atheists' interactions that remind me of fundamentalist religious adherents. As if the same religious impulses and zeal are operational in both.
That said, I agree that it has bad effects on society when people reject provable knowledge about the physical universe obtained via the scientific method, especially when large groups do so.
Also, the kind of God you believe in matters. A God who commits genocide on innocents, and who commands angels and humans to do likewise; belief in this kind of God will obviously have bad consequences for society. Also, a God who judges small transgressions by torture and execution. Also, a God who promotes an infer role in society for women, for example. Or promotes slavery.
Also, merely claiming that there is intelligent design without demonstrating at least a possible mechanism that the intelligent designer could interact with the physical atoms and molecules to implement his/her design; this is not science, nor is it responsible. For example, you might suppose that the intelligent designer fiddles around with the motions of atoms. But would he/she violate the laws of physics in doing so? There is no known mechanism for this fiddling. And how could anyone, even a super-intellect, possibly know the consequences of doing such a thing? The biochemical systems of life are simply too complex for this kind of predictive power. And why would God even want to micromanage the universe at the atomic level anyway?
Also, claiming that God provides a moral basis for society is false. Especially when the holy books of the revealed religions and revealed spiritual paths are fiction, and clearly and provably contradict science, archaeology, document analysis, and logic.
This world contains pain and suffering. Claiming that God is good but created bad is illogical. Claiming that God is good but he/she allowed for pain and suffering implies God is not so good after all. And claiming that people being tortured to death and animals eating each other alive is desirable for a higher good is an offensive idea. And claiming that God is both good and bad means God is not God.
So within these constraints, atheists should allow for belief in God. But note that such a God has no effect whatsoever on the physical world at all, and his/her influence can only enter into our minds to bring goodness and justice and beauty and joy and peace. Why should anyone object to a God like that?
I would prefer if atheists would limit their critiques of belief in God to critiques of the specific ideas such as I've outlined above. And that they would be calm and rational and polite in their demeanor. I was needlessly a Christian for 30 years because I was offended by the rage of atheists, and so, rejected their views out of hand.