Consider this definition of church:

A loose-knit network of Jesus followers who gather together to encourage each other in their spiritual life and who go out, moved by the Holy Spirit, sharing and demonstrating the Gospel.

Loose-knit. Not formal membership, just a love-commitment to God and each other. 

Jesus followers. The basic requirement for membership in the church.

Who gather together. Gathering to build one another up and to worship.

Who go out. The purpose of believers… to GO with the message.

Moved by the Holy Spirit. The one and only LEADER of the church.

Sharing and demonstrating the gospel. The reason that the church GOES.

http://sojourner.typepad.com/house_church_blog/2004/02/_house_church_b.html

בְּרָכָה
ed