That's not what hairesis actually means. It means the act of selecting and taking for oneself others, away from their church into a faction that follows you or someone of whom you are a fan. From haireO to choose or take for oneself.
One can be quite orthodox and still be a heretic (biblically), if one seeks to set oneself up as a to-be-preferred teacher, and tries to peel off Christians from some other orthodox group to follow your podcasts or sit under your pulpit by slander or innuendo aginst other pastor/teachers. "I prefer Peter." "I prefer Apollos." I prefer Paul." "I prefer Thieme." These are carnal heretical attitudes, if Paul, Apollos and Peter and Thieme are all preaching and leading others to Christ.
Here is an example of a heretical organization from history.
This organization was regarded as heretical by orthodox (traditional) Christianity in the 16th Century.
Protestantism (16th Century)
Protestant groups display a wide variety of different doctrines. However, virtually all claim to believe
in the teachings of
sola scriptura (“by Scripture alone”—the idea that we must use only the Bible when
forming our theology) and
sola fide (“by faith alone”— the idea that we are justified by faith only).
The great diversity of Protestant doctrines stems from the doctrine of private judgment, which denies
the infallible authority of the Church and claims that each individual is to interpret Scripture for himself.
This idea is rejected in 2 Peter 1:20, where we are told the first rule of Bible interpretation: “First of all you
must understand this, that no prophecy of Scripture is a matter of one’s own interpretation.” A significant
feature of this heresy is the attempt to pit the Church “against” the Bible, denying that the magisterium
has any infallible authority to interpret Scripture. This doctrine of private judgment has resulted in thousands
of different Christian denominations and quasi-Christian splinter groups throughout history.
By the way, it is not
sola fide (by faith alone) anyway; it's by grace through faith.