We are agreed that we have not kept the rules right. And if salvation is by LAW, there is no room for grace. It makes excuses for our shortcomings, it rationalizes our mistakes and errors, it talks all around the matter. Keep them and be saved. Grace is not legalism.
Legalism ignores our true fallen nature.
No one can be saved by keeping the rules because not one of us ever does that. The grace of God is something else. It was almost inevitable that a showdown would come in the early church on this matter. Peter was one spokesman in the Jerusalem assembly. God had cleansed the hearts of both Jewish and Gentile Christians by faith.