If a leader can teach such, how many people fell into sin by listening to and following such teachings? One must have said “yes” to temptation to preach such. Balaam can quote the bible and he uses the Word of God for his own advantage. Remember when the devil tempted Jesus in the wilderness, he quoted the bible. Do not expect the devil to come having horns as a tempter, but even a man with a title of a prophet, evangelist, pastor, teacher or apostle can come carrying a contrary spirit.
Foreign doctrine goes as far as undermining others or thinking that you are better than others. Some people [ignorantly] preach such messages because they heard it from somewhere. It is God who gives spiritual shepherds, and the moment one sees themselves better than their shepherd, the Jezebelic spirit has taken over.