My definitions of lhp came initially from hinduism, we must have read different things. Later stuff on lhp in my definition, paticularly on the core emphasis of the ego and self awareness in the lhp was more refined by Edward Carpenter.
Pagan and Christian Creeds Index
That was written in 1920. He refers to it as "sin" or "original sin", not LHP.
As far as the worship thing goes, I don't think it's worship that's taboo, it's really self sacrifice and/or placing something on a pedestal higher than one's self. I'm going to drop the name you were probably waiting to hear, it probably originated or was popularised in the good ol' Satanic Bible.
Bringing up the worship thing again in response to me here I think was misdirected. Again, I'm calling the essence of LHP to be the ego, not rejection of gods. The ToS, for example, I'd say is extremely left.