Local church membership is a scourge upon the church. It is based solely in man-made tradition. There is utterly no biblical basis for it whatsoever. Local membership causes unnecessary division between brothers and sisters in Christ.
This is not just a church issue. It is also a salvation issue. Many people who give no evidence of a relationship with Jesus Christ are depending upon their church membership certificate as some sort of ticket to heaven. What a dreadful situation this is.
God has called his church to be one. A tangible way to encourage unity among the greater body of Christ would be to jettison the idea of local church membership altogether. It is not only unneeded but harmful to the body.