I would rather say they dismiss it as dangerous overall. Religion is many things, and some of the things are good: it provides community, a sense of perspective above the rat race, and an answer to the questions that don't really have answers, like "why are we here". But to do so it requires obedience to a lie, and there are those who believe that truth and reality are too important to allow a comforting lie to have primacy. For them, religion is not worthless, as in "having zero worth": it's worth less than nothing; it's harmful. I can see both sides, but I think I agree with the idea that ultimately it's easier to provide community and consolation to an atheist than to replace the understanding of reality that most religions deny to their adherents.