We cannot justify the new entries. Because there is only one body of Christ, there is only one church (Eph 4:2-6). Jesus' prayer of the church was, 'that all may be one, as you Father, are in me, and I in you" (In. 17:21). In this church he has assured his presence for ever (Mt. 28:20; In 16:7; Acts 2:4). The gates of Hades will prevail against that (Mk. 16:18). Jesus prayed that all those who believe in him be united under one shepherd. This prayer will be fulfilled when all Christians unite in the leadership of Pope, the successor of Peter and visible head of church.
But selfishness, intellectual pride and ignorance give birth to new doctrines and new denominations. Till AD 1653, there was only one church in India, the Catholic church established by St. Thomas the Apostle who had the favour of experiencing the risen Lord. Later, due to various reasons, different churches such as Jacobite Syrian church, Orthodox Syrian church, Marthoma Church etc. came into existence. Still later came CSI, CNI and Pentacostal groups. St. Paul had predicted such divisions when he said, ' the time will come when they will not endure sound doctrine, but according to their own desires, because they have itching ears, they will heap up for themselves teachers; and they will turn their ears from truth, and beturned aside to fables" (2 Tim 4:3-4). So let us be watchful in all things (V 5), and entrust ourselves to the teaching authority of the church. Which alone is entitled to teach the true doctrine.