The invisible church
What is the invisible church and who is part of it?
In This We Believe, a statement of belief of our church body, we profess: “1. We believe that there is one holy Christian church, which is the temple of God (1 Corinthians 3:16) and the body of Christ (Ephesians 1:23; 4:12). The members of this one church are all those who are the ‘sons of God through faith in Christ Jesus’ (Galatians 3:26). The church, then, consists only of believers, or saints, whom God accepts as holy for the sake of Jesus’ righteousness, which has been credited to them (2 Corinthians 5:21). These saints are scattered throughout the world. All people who believe that Jesus is their Savior from sin are members of the holy Christian church, regardless of the nation, race, or church body to which they belong.
“2. We believe that this holy Christian church is a reality, although it is not an external, visible organization. Because ‘man looks at the outward appearance, but the Lord looks at the heart’ (1 Samuel 16:7), only the Lord knows ‘those who are his’ (2 Timothy 2:19). The members of the holy Christian church are known only to God; we cannot distinguish between true believers and hypocrites. The holy Christian church is therefore invisible and cannot be identified with any one church body or with the total membership of all church bodies.
“3. We believe that the presence of the holy Christian church nevertheless can be recognized. Wherever the gospel is preached and the sacraments are administered, the holy Christian church is present, for through the means of grace true faith is produced and preserved (Isaiah 55:10,11). The means of grace, therefore, are called the marks of the church.”
You can read the paragraphs quoted above in context via this link.
In short, visible churches are those gatherings of people where you might find believers and unbelievers and hypocrites. You can see who belongs to those churches. By contrast, only believers in Christ are part of the invisible church, and because only God can look into a person’s heart, only God knows who is a member of that church. The invisible church is what we have in mind when we say in the Apostles’ Creed: “I believe…in the holy Christian Church, the communion of saints.”