Maybe. Before he nuked his blog, Scott Alexander at Slate Star Codex had a theory that New Atheism failed because it was a failed harmatiology. It couldn't explain the nature of sin.
New Atheism, as far as I could tell, couldn't give an honest answer as to the nature of sin. It's main argument was that you didn't need God to be a good person, and the only reason why people did evil stuff was because religion made them stupid and irrational.
As religion faded from the public sphere, this explanation became untenable. Sure, it was baloney to begin with, but it was no longer possible for the average person to correlate bad behavior with religion. They could see this same behavior coming from people who had nothing to do with organized religion. Sin exists, and people need a reason why it exists, so many of them went looking for that answer.
That may be part of it, but the thing is the "sin" that they blamed on religion, if you actually studied history and looked at the recent past, was never actually pushed by religion. The main force blaming religion for those evils was not the New Atheists, after all the "evil Christian Crusades" idea long predates the New Atheist movement, to use but one example. Or, to look at more recent items, given that a lot of New Atheists were Millennial Geeks and Nerds, they often blamed the Dungeon and Dragons Moral Panic of the 1980s (bear in mind, that means none of the them were old enough to really know what was going on at the time), which as I've shown elsewhere here was not actually driven by the religious but rather very much by the mainstream media, who later on changed their tune about it all and in turn blamed the conservative Christians in order to weaken them politically.
In short, New Atheists failed to address the problem of evil, but the reason they even began down the path of thinking of Religion as the source of evil had, in large part, to do with the fact the left had been waging a culture war against traditional religious values since at least the 1960s, while the intellectual elites had been railing against it since the Romantic Movement of the 19th century at LEAST. In short, New Atheists were merely the most recent shock troops against religion and when they had served their purpose, they were abandoned. They didn't create any of the narratives regarding religion they espoused, nor were any of their criticisms of religion, especially Christianity, anything new. They were just fed a narrative, turned into drones in the leftist nigh constant war against Christianity, and then when their use was at an end, those who had their "My God, what have we done" moment were discarded as to dangerous to keep around, while the rest were fed a new narrative.
