Has someone ever asked you why you are part of the church that you are? There are surely many reasons that someone could offer (and often, very personal reasons) to that kind of question, but can I ask you to think about something? If someone asked you the reason you are part of your church, could you answer, “Because it’s the one you read about in the Bible”?
Think about the simplicity but also the certainty of that answer. The Bible teaches that there is “one church” (Eph. 1:22-23+4:4). Is your church that church? The church that is in the Bible remained steadfast in teaching the “one faith” (Eph. 4:5), the pure “doctrine of Christ” (2 John 9-11), without any kind of addition, subtraction or modification (Gal. 1:6-9; Rev. 22:18-19). The church in the Bible preached the same message everywhere (1 Cor. 1:10; 4:17; 7:17; 14:33; 16:1). The church in the Bible worshiped in the same way (Acts 2:42; 20:7) and taught the same plan of salvation (Acts 2:38; 8:35-39; 16:30-34; 22:16; Rom. 10:13-17; etc.).
Is your church the one that’s in the Bible? Are you absolutely certain?