I just finished the first part of Albion's Seed about the puritans, it's really fascinating and so well-written.
As for the "continuation of puritanism by other means" by modern liberals, what struck me is that the puritan culture is exactly, likeprecisely, what the 68ers fought against. Almost every single puritan trait is one specifically called out by the 60ies revolution as reactionary and the arch-enemy that needs to be fought.
What happened was that a whole generation created this puritan foe in their minds and equated it with their parents' generation, whether that was actually true individually or not. (Side note: puritanism is very similar to classical Judaism, which also helps explain why there were so many Jews in the 60ies movement.) But we know how such blind rebellion against parents ends: you are doomed to repeat their mistakes and become in many ways the very foe you fought against.
Just one example among many on how this played out: the puritans were totally against expressing beauty in their dresses. Now, the 60ies/70ies saw a total individualization of dress as a form of rebellion, but it wasugly. It was all over the place and totally lacked the finesse, harmony and deep expression associated with advanced art, including advanced taste in dress. It was just all over the place. There is also the "leftist intellectual style" that emerged and that is actually very, very similar to the puritan way of dressing. And of course, the feminists back then and the SJWs today make it a point to look ugly and unsexy! And now, it has come to a point where all this postmodern designer fashion isn't even about "rebellious sexiness" anymore, it's just ugly and repulsive.
In so many ways, the leftists/liberals have come full circle by opposing the (real and phantom) puritanism of old - rampant authoritarianism and social control, the group above all else, the eradication of beauty, the worship of an irrational and crazy-making religion etc.
From a higher perspective, it seems to me that the negative energies/overlords create some sort of dialectic, like an electric motor, where people rebel against something, but without deep reflection and without a spiritual "spark", and so they are just running in circles on a 2D plane, never goingup. That way, they are kept at a very low frequency and generate tons of low spiritual energy, ideal nourishment for the higher-ups I suppose.
Anyway, at first I couldn't really make the connection between puritanism and modern liberalism/postmodernism, except for the super-authoritarian nature of both ideologies/cultures. But since I know very well what the 68 movement, at least in Europe, was all about, and how those people later developed, I find the similarities striking - in opposing puritanism, they re-enacted it: if not in the details, then in the general patterns, which are the opposite of spiritual progress, wisdom, understanding, truth and beauty.