If you think there’s no slippery slope, just look at the recent history of the Boy Scouts. Once you throw out anything that God says, once you decide God’s word doesn’t apply, there is no limit to the injustice and immorality that might be approved. The same applies to worship of the body of Christ, to the work of the church, to life in Christ, which quickly becomes life outside of Christ, the work of man, and the worship of human innovation.
When you say, “My church teaches …”, or “My pastor (preacher, priest, etc.) says …”, instead of saying, “The Bible teaches …”, you have abandoned the word of God and confirmed that you belong to a human religion.
When we need vocabulary that is not in the New Testament for practices in the church, it is likely that those practices are not sanctioned by God.
Some may say, “What difference does it make?” This attitude has caused wholesale departure from God’s truth; this attitude causes multitudes to do as they please and refuse to bow to the authority of Jesus Christ. —Basil Overton