Isn’t pantheism the same thing as atheism?

[Belacqua]

I heard that quote in a movie a long time ago. Val Kilmer, The Doors. I always liked it. Didn't know it was Blake.

It would be interesting to trace this back.

I'm pretty sure Jim Morrison got it from Aldous Huxley, who quoted Blake but added the connection to psychedelic drugs. Blake got it largely from Jacob Boehme and a few other Protestant mystics. Who got it from a whole series of minority-tradition Christians, including Eriugena, Pseudo-Dionysius, etc. And before them Neoplatonists who believed in the One. 

So this whole pantheism thing is a variation on something with deep roots.