Here is a list of unbiblical teachings that are accepted in some church groups:
Sin-you-must — teaches that you will continue to sin after being saved, and that a believer sins in word, thought, and deed daily. This teaching makes people easy prey to temptations and leaves them thinking that sin in a believer’s life is normal.
Further Reading: Sin You Must Teaching
Easy-Believism — teaches that godly sorrow, repentance, and obedience to Christ are not necessary. Instead, all you must do is believe. This teaching can have people that are only under conviction thinking they are saved.
Eternal Security> — teaches that if – once you are saved – you go back to your old life and live and die in sin, you will still go to heaven. This teaching gives a false sense of security and can work a carelessness in how you deal with temptations.
Further Reading: Considering Eternal Security and the IF Scriptures
Sinning Christians — teaches that a Christian will not experience spiritual death if they commit one sin, and that it takes either practicing sin or ‘big’ sins like murder or adultery before you are spiritually separated from God, and are no longer a child of God. This teaching takes away the seriousness of what happens when a Christian sins. It also leaves a person thinking they are a Christian when they are not.
Further Reading: Committing Sin Brings Spiritual Death
Unconditional Election– teaches that God pre ordained- before the world was created – who would be saved. Those who are not pre ordained as saved, have no chance to be saved. This teaching will leave the saved with a false sense of security and the unsaved with no hope that they can do anything about their unsaved state.
Pentecostalism– teaches that a prayer language called ‘tongues’ is the evidence of having experienced a higher spiritual experience after conversation called the ‘Baptism of the Holy Spirit’. This teaching will leave a person trusting in an external manifestation that is experienced in unorthodoxed groups like the Mormons as evidence of conversion and a higher spiritual experience.
Baptismal Regeneration — teaches you are saved when you are baptized and you can’t be saved without water baptism. This teaching can cause people to trust in baptism as proof of salvation, and can leave those that have been converted – but not baptized – doubting their conversion.
Mistakes-are-sin– teaches that mistakes in opinion, judgments, and actions including faults, errors, and any conduct that comes short of complete angelic perfection is unwillful sin, and that there is no difference between what some are calling unwillful sins and willful sins. This teaching makes no differentiation between mistakes and sins. This teaching leads the Christian to confess that they are a sinner and opens them up to the unbiblical teaching of ’sin-you-must’ – with the excuse that we are all human and can’t help but make mistakes.
Further Reading: Are Errors, Faults, and Mistakes Sin
One True Visible Church (OTVC)– groups that hold this doctrine teach that their group is the one true visible church. They teach that all honest people will come to them, and that God is not working with any other group but them and if any leave the group, they are no longer saved. Examples of groups that hold this teaching are: The Watchtower Society, 2 x 2, Church of God in Christ Mennonite (Holdeman), and The Church of God (Restoration). This teaching is used to build a union in conduct, dress, and doctrine by the groups ministers – which claim they have the authority to cast disagreeing members out of the Body of Christ, and to take away their right standing with God.
Further Reading: One True Visible Church (OTVC) Teaching