I've never thought of myself as a "cultist", but if that's what I am because I believe the KJBible is the pure Word of God, then so be it.
No cultist considers himself a "cultist." Rather, a cultist considers everyone else who has some contact with Christianity-- but, of course, an "apostate" form of it, since their defining tenets are different-- something of a 'cultist,' whether they use such a word or not.
To 'Jehovah's Witnesses,' the "pure Word of God" is anything that comes from the Wathctower Bible and Tract Society. To the Mormons the pure Word of God is anything that comes from their board or "prophets" {and these can amend the writings of Joseph Smith, even though they are considered "inspired"-- compare this to R. Catholicism}. To groups like The Way International, and the International Church of God, they 'believe the Bible,' but only their own peculiar interpretation of many parts of it.
I have long contended that "cult" is to religion as "neurosis" is to psychology. The terms are imprecise and there is no definite separation between those terms and what is standard or normal or comprehensively thought out.
So do KJVO's have 'cultic' beliefs that they, and only they, consider as proof of the correctness of their defining tenet? Yes. But do they have a central authority like the major cults? No. Instead they are more like the 'Churches of Christ,' which maintain that only their view of scripture and the church is the correct one. And also like the C of C's, they can vary considerably about many of their practices; e.g, some C of C's do have instrumental music, though the large majority still do not. But C of C's are cultic in their view that salvation is of both works and faith {most will say so}, and that they would never belong to any local church which did not identify itself as a "Church of Christ" {the only possible name for Christ's church, according to them}.
Still, neither C of C's nor KJVO's have a central authority, but both believe any other form or practice of Christianity outside their defining tenets is 'apostate,' and they do not agree among themselves whether salvation is only of their church or only of their translation of scripture. Their beliefs are cultic because they consider every other besides themselves outside of the truth, yet they are no centrally organized cult.