Most within non-institutional churches refer to themselves as "conservative" churches of Christ and the non-institutionals refer to the Bible college-supporting, "mainstream" or "sponsoring church" congregations as "liberal," which leads to some confusion since the "mainline" churches use the terms "conservative" and "liberal" to refer to two separate strands within their own congregations. Many in the non-institutional congregations are not aware that institutional congregations have their own differences, and consider them all as "liberal." Many in the institutional congregations do not know the history or existence of the non-institutional groups.