The mark of a fully-devoted disciple is a disciple who is making other disciples, a disciple who is bringing others to the faith either through personal evangelism or bringing others with them to church to introduce them to Jesus. Evangelism is the greatest form of discipleship.
If we in our churches are not creating disciples who regularly create other disciples, we are not succeeding in the Great Commission. Christ called us all to share the good news of eternal life that He made possible through His death and resurrection. If we are not making disciples then what are we doing at church, hopefully not making Couch Potato Christians who sit and soak rather than serve and send. If you want to see who the fully-devoted disciples of Jesus Christ are, don’t necessarily go to the biggest churches or find the Christians with the most seminary degrees or the ones who are the most confident (i.e. arrogant) about their doctrine. Find disciples who are making other disciples. Evangelism is the greatest form of discipleship.