As long as Christians can unite around that one focal point, we are united. Theologically, we can disagree about anything else. The apostles and the early Christians often disagreed, sometimes vehemently, and they had to work diligently to maintain their unity around that one focal point. The Judaizing issue threatened to tear the church apart at an early stage. Paul's tolerant attitude toward disagreement manifested itself in many ways.
Division always racks the body when other standards are elevated to the level of the cross.
The Judaizers wanted the cross plus circumcision. If only all Christians would be required to confess Christ crucified and the Mosaic code, there would be unity. If only all Christians would be required to confess Christ crucified and a certain millennial theory, Christ crucified and a certain catechism or confession or statement of faith, then there would be unity. These aspirations are myths. In the first place, Christians in their diversity are not able to come to this type of agreement.