I call them "spectator Christians." I admit, there have been seasons in my life where I was a "spectator Christian." At times, my church experience consisted of entering the back door on a Sunday morning, sitting down in my regular seat, singing hymns and praise songs with the congregation, soaking in the teaching of God's Word, and then exiting out the same back door. That basically was it. No involvement in a Sunday school class. No small group. No service within the church. But, let's think about what Jesus said in Mark 10:45 (ESV), "For even the Son of Man came not to be served but to serve, and to give his life as a ransom for 'many.'" If we claim to be Christians, then we must become Christlike and that means serving others. That's why Doug Fry, an ABWE (Association of Baptists for World Evangelism) church planter in Portugal says that when new believers come to their church, "we...imediately get them serving."
Click here for a link to ABWE
(Photo of Doug and Sharon Dry, ABWE missionaries in Portugal)