In fact, I challenge any atheist, New or old, to send me their answer to the question: "Why is there something rather than nothing?" I can't wait for the evasions to pour forth. Or even the evidence that this question ever could be answered by science and logic.Take another case where I don't have an explanation for some chain of events. I have no idea what caused the dinosaurs to go extinct, for example. If I don't know, can I still believe confidently it wasn't X or it wasn't Y? Of course I can! I can believe it wasn't, for example, human hunting (no humans back then) and it wasn't too much smoking (no cigarettes back then).
Likewise, I can not know what caused there to be something rather than nothing, and still believe it wasn't Donald Trump, wasn't mixing vinegar with baking soda, nay, wasn't some all-good immaterial mind with stupendous causal powers. I might have very good reasons for all those denials--Not Trump because no people back then. Not vinegar/baking soda because there wasn't any. Not an all-good immaterial mind with stupendous causal powers...because the whole idea is incoherent.
I admit I don't know why there's something rather than nothing, but not knowing why the universe exists doesn't (in the least) make it irrational to be an atheist. Rosenbaum taunts the new atheists--
... many of the New Atheists seemed to have stopped thinking since their early grade-school science-fair triumphs ...but I think Rosenbaum stopped thinking after he started stewing about why there's something rather than nothing. His first hunch was that if you don't know, no conceivable answer can be excluded. Further reflection should show him this isn't true.