The Jerusalem Council kept the door of salvation open to all Jews and non-Jews who repent and believe in Jesus Christ.
While the Old Testament is still valid, we also have the message of the one who was raised from the dead.
In the middle of writing about his sufferings for the church, Paul explained that the message he preached was a mystery hidden for generations...
Since James is the likely the oldest writing of the New Testament, it appears from James 4:1-17 that church conflicts have been around almost...