Isn't this what most of us have done, listen to one viewpoint from the pulpit, year after year? The Merriam-Webster has an interesting paragraph on propaganda:
But "most of us" attend churches where the Pastor is anointed by God to preach His Gospel, and is the Spiritual leader of the congregation. As well, we have Sunday School classes, and Wednesday evening Bible Studies, and various groups that study Scripture as well.
IF the Pastor is preaching the Gospel of Jesus, then that ONE TEACHING is certainly the ONLY TEACHING we should be listening to.