He who believes in Him is not condemned; but he who does not believe has been condemned already, because he has not believed in the name of the only begotten Son of God. And this is the condemnation, that the light has come into the world, and men loved the darkness more than the light, because their works were evil. For everyone that does evil hates the light and does not come to the light, lest his works be exposed. But he who does the truth comes to the light, that his works may be revealed, that they have been done in God.”
We live in an age when many, who don’t come to the Light, come to Church anyway and even build their own Churches. They’ve come to the Church, but they’ve not come to the Light, and the Light has not come into them.
Within these verses there’s a definition of what conversion is, and what the true Church is : both are defined by the Light, and what the Light does – He exposes all the darkness and replaces it with Himself, who is the Light.
The Light has come into the world… – there’s our definition of true Christianity and the true Church: The Light has come.
Where the darkness is not exposed and not removed, we can’t call such a person a Christian, nor their Sunday meeting a Church.
When the darkness can be ‘at home’ in a Church setting it shows there is no Light there. Where the Light is, the darkness cannot hide, for long, anyway. Sooner or later the true nature of people is revealed, and, if they love the darkness, they will be repelled away from the Light.
Isaiah 8:20 To the law and to the testimony: if they speak not according to this word, it is because there is no light in them.
It was the wisdom of God to build His Church with Light. Where His Light is people see Jesus. Darkness blinds.