St. Anne's Church, Augsburg in the context of "Interdenominational"

The "Joint Declaration on the Doctrine of Justification" (JDDJ) is a document created and agreed to by the Catholic Church's Pontifical Council for Promoting Christian Unity (PCPCU) and the Lutheran World Federation in 1999 as a result of Catholic–Lutheran dialogue. It states that the churches now share "a common understanding of our justification by God's grace through faith in Christ." To the parties involved, this substantially resolves much of the 500-year-old conflict over the nature of justification which was at the root of the Protestant Reformation. The Joint Declaration on the Doctrine of Justification teaches that "good works are a genuine response to God’s grace, not the cause of it".

Through the Joint Declaration on the Doctrine of Justification, "the formal condemnations of both the Catholic and Lutheran Churches against one another" were rescinded. As a result of the same, Lutheran bishop H. George Anderson stated that "there is an increasing common faith" and that those joined in Lutheran-Catholic interdenominational marriages "share a common faith instead of coming at it from two separate traditions." Catholic brother Jeffrey Gros, the associate director of the Secretariat for Ecumenical and Interreligious Affairs, held that Catholics and Lutherans should be thankful to God "for the grace they’ve received in the death and resurrection of Jesus Christ" and that "We’ve learned, both through our scholarship and also through our face-to-face dialogue, that we believe this together". Gros noted that due to being in agreement on the doctrine of justification, the Catholic–Lutheran dialogue would lead to finding agreement on other theological issues.

Ecumenism (/ɪˈkjuːməˌnɪzəm/ ih-KEW-mə-niz-əm; alternatively spelled oecumenism) – also called interdenominationalism, or ecumenicalism – is the concept and principle that Christians who belong to different Christian denominations should work together to develop closer relationships among their churches and promote Christian unity. The adjective ecumenical is thus applied to any non-denominational or inter-denominational initiative which encourages greater cooperation and union among Christian denominations and churches. Ecumenical dialogue is a central feature of contemporary ecumenism.

The fact that all Christians belonging to mainstream Christian denominations profess faith in Jesus, believe that the Bible is inspired by God, and receive baptism according to the Trinitarian formula is seen as being a basis for ecumenism and its goal of Christian unity. Ecumenists cite John 17:20–23 as the biblical grounds of striving for church unity, in which Jesus prays "may all be one" in order "that the world may know" and believe the Gospel message.

Ecumenism (/ɪˈkjuːməˌnɪzəm/ ih-KEW-mə-niz-əm; alternatively spelled oecumenism) – also called interdenominationalism, or ecumenicalism – is the concept and principle that Christians who belong to different Christian denominations and theological traditions should work together to develop closer relationships among their churches and promote Christian unity. The adjective ecumenical is thus applied to any non-denominational or inter-denominational initiative which encourages greater cooperation and union among Christian denominations and churches. Ecumenical dialogue is a central feature of contemporary ecumenism.

The fact that all Christians belonging to mainstream Christian denominations profess faith in Jesus, believe that the Bible is inspired by God, and receive baptism according to the Trinitarian formula is seen as being a basis for ecumenism and its goal of Christian unity. Ecumenists cite John 17:20–23 as the biblical grounds of striving for church unity, in which Jesus prays "may all be one" in order "that the world may know" and believe the Gospel message.