Created in 1853 by a protestant regarding the origins of the Catholic Church, later made famous by David Icke. With no actual references to the religion of Babylon.
https://en.wikipedia.org/wiki/Alexander_Hislop

The true "Illuminate" types are Gnostics ('knowers') that were formed by Judeans living in Alexandria Egypt in the 60's AD. A mixture of inverted Platonism, Isis worship, and Paul's Christianity (see the 1st chapter to the Corinthians who were practicing sex magic).