@naturallyInconsistent while there is a certain overlap in personnel, it's not really New Atheism that turned into rationalism/EA (arguably the phenomenon is more that
both funnel(ed) significantly into neoreaction or alt-right) . If you want to spend probably more time than necessary on the history, see e. g.
aiascendant.substack.com/p/extropias-children - the transhumanist/longtermist agenda is older and more obscure than NA