Over the past two millenia various groups of believers have taken a verse here and a verse there out of context and developed an entire branch of theology from it. Methodists, Episcopalians, Baptists, Messianics... we are all guilty of this to one degree or another. It is often times the consequence of our finite understanding, a short-sighted focus, or the limited amount of time we have to study the whole counsel of Scripture.
Some of these teachings are born from a need to correct a specific error or heresy being taught. For example, there are some doctrines from the first and second centuries that were born out of the need to correct certain Gnostic heresies. These doctrines resulted in a narrow focus on the humanity of Messiah almost to the exclusion of acknowledging His deity.
In other circumstances teachings are born out of good intentions but, ignoring the broader messages of Scripture and focusing on minute details, they ultimately end up in error. Sacred Name theology is one extreme example of this.