Beyond being grossly overused and conjuring a horrendous massacre, it's not even technically accurate.
Before we get to the Kool-Aid part, let's recap some horrible American history. Jim Jones was a complex man. Long story short, he was a communist and occasional Methodist minister who founded his own pseudo-church in the late 1950s, called the Peoples Temple Full Gospel Church -- known in short as the Peoples Temple. (And yes, the omission of the possessive apostrophe is intentional, as the name apparently refers to peoples of the world.) While Jones called it a church, it was actually his version of a Marxist commune, with a smattering of Christian references thrown into his sermons/diatribes. The Peoples Temple was arguably a cult, demanding serious dedication (and financial support) from its members.
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As the Peoples Temple grew throughout the 1960s, Jones lost the plot on the whole Marxism thing and began to preach about an impending nuclear apocalypse. He even specified a date (July 15, 1967), and suggested that after the apocalypse, a socialist paradise would exist on Earth. And where would that new Eden be? Jones selected the remote town of Redwood Valley, California, and moved the Peoples Temple there prior to the deadline.
As you know, that end-of-the-world deadline came and went with no nuclear holocaust. In the following years, Jones abandoned all pretenses of Christianity and revealed himself to be an atheist who had simply used religion as a tool to legitimize his views. Jones said: "Those who remained drugged with the opiate of religion had to be brought to enlightenment -- socialism." Oh, and Jones was a drug addict, preferring literal opiates to metaphorical ones.