Almost by definition, secularism cannot be a future: it's a present-tense culture that over time disconnects a society from cross-generational purpose. Which is why there are no examples of sustained atheist civilizations. "Atheistic humanism" became inhumanism in the hands of the Fascists and Communists and, in its less malign form in today's European Union, a kind of dehumamism in which a present-tense culture amuses itself to extinction. Post-Christian European culture is already post-cultural and, with its surging Muslim populations, will soon be post-European.
I bless God for this retirement: I never was more thankful for any thing than I have been of late for the necessity I am under of self-denial in many respects.