Ecumenism seeks unity among groups that call themselves Christian, but Scripture teaches that true unity exists only among those who share the same Gospel. Partnering in evangelism with groups that deny essential doctrines can confuse or compromise that Gospel, so believers should join only in ways that uphold biblical truth.
The term ecumenism is used to describe everything from simple cooperation among Orthodox churches with differing conclusions on non-essential doctrines to partnering with groups that deny essential Christian beliefs. The Old Testament sets the foundation for this principle by showing that God set apart the Hebrews to be His people, set apart from pagan nations (Exodus 19:5-6; Deuteronomy 7:3-6, 12:30-31; Isaiah 52:11). The New Testament continues this teaching, showing that true unity is grounded in the Gospel: believers share “one Spirit,” “one Lord, one faith,” and one hope (Ephesians 4:4–6). Paul urged the church to strive together “for the faith of the gospel” (Philippians 1:27) and to be of “one mind” in Christ (Philippians 2:1–2). True unity, therefore, comes only from a shared understanding of salvation.
Because the Gospel defines Christian identity, the Bible warns against partnerships that imply spiritual agreement with those who preach a different message. Paul commanded believers not to join with those who compromise truth (2 Corinthians 6:14–17) and to reject teachings that distort the gospel (Galatians 1:6–9). John warned that supporting false teaching makes one a participant in it (2 John 10–11). Even when pursuing worthy goals such as pro-life movements, joining with groups that deny the core Gospel can blur doctrinal boundaries, minimize essential truths, and confuse outsiders about salvation. Christians are called to do good (Galatians 6:10) but never by weakening the message that unites them in Christ.
“Do you want to be my friend? Check the box: Yes or No.” Kids are direct about who they want to be in their inner circle. Christians may need to be more subtle, but we should, nonetheless, answer these two questions before partnering with an ecumenical movement: Does the group believe in and follow the Gospel as taught in God’s Word? Scripture never allows believers to join in evangelistic outreach with those who deny the true Gospel. Doing so suggests that you share the same message of salvation. Christians cannot not stand with those who preach a different Christ or a different way of salvation than what Scripture teaches. Refusing to do so is how you love both Christ and the people who need the truth.
But what about non-evangelistic issues, such as pro-life work or poverty relief? Those can be more complicated. You may at times labor alongside people who do not share your theology, but you must do so carefully. Make sure it is clear that you do not share the same doctrine and avoid anything that suggests spiritual unity where none exists. Also, remember that a false Gospel often reshapes how people understand human need. It can push them to focus primarily on improving earthly circumstances while ignoring the soul's eternal condition. As you engage in good works, don’t let the Gospel fade into the background. Keep it at the center and speak the truth plainly.