No. Turning from your sin and trusting in Christ makes you a Christian, not being a member of a church.
However, church membership is meant to be a church’s corporate affirmation of your profession of faith in Christ. Membership is supposed to be the church saying, “We’ve looked at your life. We’ve heard your testimony and your explanation of the gospel. You look like a Christian to us, so we’re happy to affirm you as a Christian, welcome you as a brother in Christ, and care for you and watch over you.”
Is a Christian obligated to treat members of his church any differently than he treats other Christians?9Marks
The apostle Paul urges Christians to do good to all men, especially those who are of the household of faith (Gal. 6:10). But the Bible also seems to indicate that Christians have a special responsibility to love, admonish, and care for those who are members of their local church.
Many churches attempt to adopt an inviting and warm posture by allowing both non-Christians and prospective Christian members to serve publicly in the church. Certainly outreach is a good motive. But is this the whole picture? We believe that public acts of service—like serving in the nursery, teaching children, leading music, teaching adult Sunday school, and leading a small group—should be reserved for members of the church. Why?
Tolerance and inclusivity are the quintessential postmodern virtues. It seems that the only way to be genuinely wrong in contemporary western society is to ever exclude anyone. Contemporary westerners are born cherishing particular conceptions of diversity, inclusion, and tolerance.
A well-defined membership commends and clarifies the gospel by