There are four basic options. A group can be orthodox and holy (a church). A group can be orthodox and unholy (a sect). A group can be heterodox and externally moral (a legalistic cult). And a group can be heterodox and immoral (an antinomian cult). And because one sin always leads to others, groups can always morph from one category to another. That happens also.
Also be aware that we are using the word cult here in its common sense, meaning a religious group that has something seriously wrong with it.
What is a Cult? What is a Sect? What is a Church?, October 16, 2021