Many people would say they are believers,but their lifestyle and somethings about them don't show it at all. And it would be quite judgemental to call one an unbeliever.so what really qualifies one as an unbeliever? Is it jus not believin in the existence of GOD?

denying the lordship of JESUS CHRIST

Before one can be called a believer, a lot of factors have to be put into consideration. Top on the list would be whether the individual does what God wants of him/her or not at any point in time.

This actually goes beyond proclaiming the Lordship of Christ. I believe firmly that true believers are found in every work of life, which basically depends on the individuals level of exposure. Believers can be found in Christianity, Islam, Hinduism, Paganism, Atheism etc.

A believer, by my definition are those who do what God wants of them in accordance with the dictate of good conscience. By this definition, it is very possible for one to be a believer without knowing it. And whether one knows it or not, what matters is that God alone knows all those who are his.