For half a century, psychedelics largely belonged to the cultural left: anti-war, anti-capitalist, suspicious of the church and state. Now, one of the most politically consequential psychedelic drugs in the US – ibogaine – is being championed by evangelical Christians, Republican governors, military veterans, and big tech billionaires.

Many of them see ibogaine, an intense psychedelic derived from a central African rootbark, as a divine technology. In fact, some pointedly ...