While it is indubitably true that not all atheists are paragons of reason, it is also equally true that very, very few religionists have any intellectual standing whatsoever. We need to be very mindful of the fallacy of the "but whatabout..." argument.
The core of atheism is simply the understanding that extraordinary claims - especially those that would require every single aspect of reality to be different from what we know it to be - require extraordinary evidence. The myths of primitive goat-herders who knew nothing and understood nothing does not qualify as any sort of evidence. Furthermore, the various fairytales religionists look to for guidance are internally inconsistent and in a great many cases morally repugnant.
As I pointed out in my Medium article God Fails The Test, religion has no redeeming features. Atheism is merely the avoidance of absurdity. One can be dogmatic and even offensive without ever coming close to being equivalent to the abhorrent and hopelessly simple-minded worldview that religionists believe to be their "truth."