It upholds the concept of the "visible and invisible Church," meaning that all who are truly believers in every age belong to the holy Church invisible, while the United Methodist Church is a branch of the Church visible, to which all believers must be connected as it is the only institution wherein the Word of God is preached and the Sacraments are administered.
What is the concept of the visible and invisible Church?
meaning that all who are truly believers in every age belong to the holy Church invisible