It is sufficient to believe and adhere to what Christ and the apostles taught.
And conversely, it is a serious error — even a “damnable heresy” in Paul’s words — to claim that their gospel is insufficient.
Some believers have come to faith through scriptures and testimonies and preaching devoid of Trinitarianism. They believe the word of Christ and the New Testament apostles and New Testament writers. This is sufficient for salvation although they need awareness of being part of the whole body of Christ and ideally some acceptance into it, such as in baptism, laying on of hands, sealing with the Holy Spirit and gifts of the Spirit such as within worship meetings, and participation in the Lord’s Supper. On the other hand, some churches have decided that they can only accept believers who have aligned with the Trinitarian view and openly profess it. They say it is necessary to have this adherence in order to join them. Now having this view or rejecting it is debatable, either way. But where it crosses a heresy line is when it is denied that adherence to the teachings of Christ and apostles (without Trinitarianism) is sufficient. This falls into the Galatians 1 curse category.
Now a very lamentable issue occurs when no church is available without Trinitarianism. This muddies the water. It puts a stumbling block to the believer being integrated into the body.
This situation makes the Galatians 1 all the more cogent.
Let nobody cause a believer such offence.
