Final answer:
Paul taught that all Christians, irrespective of their origin, are part of the spiritual estate and true people of God if they live by Jesus's teachings of compassion and love. His concept of a universal salvation through Christ was accessible to both Jews and non-Jews, emphasizing a universal church without social distinctions.
Step-by-step explanation:
As he does in all of his writings, Paul emphasizes to the Philippian believers that it is only those who are marked by the spiritual estate as followers of Jesus Christ who are the true people of God. In his teachings, Paul explained that all Christians are of the spiritual estate, with no distinction except in office or function within the community of believers. This concept was pivotal because it rebelled against the strict social hierarchies of the Roman world at that time. The essence of being true believers was not tied to any ethnic or social status but was universally available to all who believed in Jesus Christ and lived according to his teachings of love and service.
Paul's outreach extended the invitation of faith to Gentiles as well as Jews, emphasizing a universal salvation through Christ. This idea of a universal church was revolutionary as it opened doors of faith to all, regardless of their origin. The new religion of Christianity therefore brought a message that promised unending love, forgiveness, and eternal life after death, which was very appealing to many, including those marginalized by society.
Through his letters and teachings, Paul made it clear that being part of the true people of God involved living out the teachings of Jesus Christ, which included showing compassion and love towards others, doing good works, and acknowledging God and the Last Day. Paul's influence was paramount in shaping Christianity's belief that all believers, both Jews and non-Jews, could share in the blessings of Christ.