When Christians are educated to believe that the following things are the priorities and essentials of being a Christian and evidence of salvation, then WHY should they be concerned about being a follower of Jesus and making disciples?
Go to church ..
Read the Bible .. (at least the parts that appeal to our self life)
Believe "right doctrine"
Pray .. (for things we want)
"Accept Jesus and be saved"

The messages they get in church reinforce any kind of religious activity EXCEPT dependency upon and loyalty to Jesus Christ.

ie,
Give tithes and offerings to the church if you are a Christian.
Participate in Sunday School, choir, a series of boring services each week, boards and committees and other activities that promote the institution but distract from being followers of Jesus Christ and doing His works (which are always outside of the walls of the meeting place .. ALWAYS .. but the activities inside the walls are what are promoted and they take up all the free time of these potential disciples).
The division of laity and clergy. Jesus did not create this order. It sends all the wrong messages. Until every believer is a minister, and every minister is a servant, then there is no hope for discipleship being essential, not optional.

Now, to answer your question: You cannot motivate nominal Christians. It is just like an alcoholic .. you cannot get them into treatment until they acknowledge, from within themselves, that they have a problem they cannot handle.

But, churchianity has been substituted for discipleship when these people found themselves in a crisis and sought "salvation"! And, with the full force and authority of "the church", "doctrine", the "H" word (heresy), and tradition, these people have been told that churchianity (called Christianity) is their evidence of salvation. How are you going to change the message once they have been told authoritatively that they have found salvation????

I've been dealing with this online since 1997 .. you cannot convince a churchian that their model of Christianity and salvation is wrong. They become personally abusive to the messenger .. a real commentary on their belief system! The people who visit the site and start asking questions that move them away from the system are those who have already started awakening to the reality that the system, institution and doctrinal malarkey do not solve the sin problem in their lives.

If you want to try to develop disciples within the system, you will continually be frustrated, for the very reason I stated above .. it is a change in the message which has been taught with the ultimate force of human authority.

Look at the difference in the following beliefs about Jesus Christ ...

º Jesus is the Christ, the Son of the Living God; He was buried for three days; He arose from the grave, triumphant over death; He now rules over all principalities and powers, and is the Head of the combined gathering of the people of God; and, the only way to eternal life and reconciliation with God is through Jesus Christ, and being born of His Spirit.

º Jesus Christ is our only point of Reference and His Words are our guide for faith and living.

º The Gospel of the Kingdom is: repent and believe in the Gospel; deny self; take up your cross daily; lose everything; and follow Him. Only the proclamation of this Gospel will make disciples.

º Salvation comes through obedient faith in Jesus Christ. We are not only saved from the penalty of sin, but the Salvation of the Lord includes overcoming the power and practice of sin through the empowerment of His Word and His indwelling Holy Spirit. The most important reality of our faith is experiencing God's work in us to enable us to live and be like Jesus.

º Jesus said of His gathering of disciples: where two or three are gathered together 'in My Name', He is in the midst. That is sufficient. We are not to be called rabbi or leader or pastor, for we have One Teacher and Leader and Shepherd - Jesus of Nazareth - and we are all brothers or sisters. The only authority that exists in Jesus' Church is His Words. Men and women can only represent His authority by presenting His Word and doing His works. He is the Head, and every disciple is to be connected directly to Him.

º Our task is witnessing the Message and Person of our Lord Jesus Christ, and making disciples.

º All who are walking in obedient faith to Jesus Christ and are born of His Spirit are members of His Church. Therefore, membership in an organization is irrelevant. Staying in fellowship with Christ, obeying His Words and being directly accountable to Him is the essence of being the church.