Galatians: The main theme of the letter of Saint Paul is that to be a Christian one must have faith in Jesus Christ, be baptized, and practice works of charity. He argues strongly against the Judaizers who said that Christians must keep all the laws of the Old Testament. He defends his apostolic authority as coming directly from Jesus Christ and offers many details about his personal life. Taken from a series of sermons given by Father Kenneth Baker on the Letters of Saint Paul the Apostle: Sermon 3 of 17