Cope, all of it.
Rome did itself in by becoming worldly and atheistic, and their society collapsed on itself the exact same way modern society is collapsing on itself, because nobody believes in anything anymore, as much as the Romans didn't believe in anything, either their traditions or the gods of their religion.
Notice how ever ill of modern society can be traced to the same Enlightenment that produced Gibbons in the first place. Post-modernism is the inevitable consequence of the rationalists from that age positing doubt rather than certainty as their guiding principle, which inevitably led to the rejection of reason altogether, the consequences of which can be seen everywhere in modernity, either in a "positivistic" science which claims to the be sole mean to attain to knowledge while rejection the very notion of truth (and remaining completely oblivious to this contradiction), as well as all the relativistic aberrations you seem to think Jews imposed upon us, where as we were the first ones to invent them (as Evola himself pointed out). It was during the Enlightenment that liberalism was born:
http://library.flawlesslogic.com/yockey_2.htm
And Gibbon is considered a paragon of the very age which birthed the very things you claim to be destroying the west today.
But most importantly, it was only
after the west rejected Christianity that Jews rose into prominence. A strange coincidence, to be sure.