Dave Hunt was a Christian Apologist who started his ministry in 1973. He wrote books on the End Times and exposing cults. He is not a Calvinist when teaching about Eternal Security or once saved always saved which I oppose to that false doctrine. Eternal Security has nothing to do with Calvin's Perseverance of the Saints. Calvin did not teach Eternal Security. Calvin claimed that if a saved person does not persevere to the end, that person was never a Christian to begin with.
Augustine of Hippo did not teach Eternal Security either.