You may want to read the books The Depravity of Man and the Sovereignty of God by A. W. Pink. They are available online on many web sites on the net.
We need to see mans position before a sovereign God before we can see the true need of the new birth. The new birth being provided by the Sovereign God of all creation. He has provided and has performed the the salvation of His elect. Christ has done the work and it is finished. It doesn't matter what the unbelievers of the so called churches preach. If it doesn't lift Christ up as the serpent in the wilderness it is based on lies. We can see the false doctrines of men spread all over the world in the liberal churches of our days.