According to your Wikipedia article, that group did engage in violence:Some have even applied it to themselves though:
The League of Militant Atheists[1] (Russian: Союз воинствующих безбожниковSoyuz voinstvuyushchikh bezbozhnikov); Society of the Godless(Общество безбожников Obshchestvo bezbozhnikov); Union of the Godless (Союз безбожников Soyuz bezbozhnikov), was an atheistic and antireligious organization of workers and intelligentsia that developed in Soviet Russia under the influence of the ideological and cultural views and policies of the Soviet Communist Party from 1925 to 1947.[2]
...
"There can be no doubt that the fact that the new state of the USSR led by the communist party, with a program permeated by the spirit of militant atheism, gives the reason why this state is successfully surmounting the great difficulties that stand in its way - that neither "heavenly powers" nor the exhortations of all the priests in all the world can prevent its attaining its aims it has set itself"
https://en.wikipedia.org/wiki/League_of_Militant_Atheists
Under the slogan, "the Storming of Heaven," the League of Militant Atheists pressed for "resolute action against religious peasants" leading to the mass arrest and exile of many believers, especially village priests. By 1940, "over 100 bishops, tens of thousands of Orthodox clergy, and thousands of monks and lay believers had been killed or had died in Soviet prisons and the Gulag."
I agree. I'd go so far as to call it bigoted. It implies that an atheist who dares to suggest in public that it might not be good to be religious is on par with James Kopp or the Lord's Resistance Army.I do agree that, in contemporary usage, it is a bit hyperbolic and carries unnecessary connotations due to religious militants who are actually violent.
... but not ideal or accurate.A term like evangelical atheists would probably be better.
What about "unapologetic atheist"? That seems to me to be a pretty accurate description of what's going on: the people who are labelled "militant atheists" or "evangelical atheists" by theists are just the atheists who decide not to treat their atheism as something shameful that needs to be hidden from polite company.