"Many are willing to believe in Christ if he remains a merely spiritual reality. But when we preach that Christ has become a particular man in a particular place issuing particular commands and dying on a particular cross exposing the particular sins of our particular lives, then the preaching ceases to be acceptable for many.
This is the stumbling block of the incarnation—when God becomes a man, he strips away every pretense of man to be God. We can no longer do our own thing; we must do what this one Jewish man wants us to do. We can no longer pose as self-sufficient, because this one Jewish man says we are all sick with sin and must come to him for healing. We can no longer depend on our own wisdom to find life, because this one Jewish man who lived for 30 obscure years in a little country in the Middle East says, "I am the way the truth and the life."
When God becomes a man, man ceases to be the measure of all things, and this man becomes the measure of all things. This is simply intolerable to the rebellious heart of men and women. The incarnation is a violation of the bill of human rights written by Adam and Eve in the Garden of Eden. It is totalitarian. It's authoritarian! Imperialism! Despotism! Usurpation! Absolutism! Who does he think he is?!
Piper on 1 John 1:1-4 - manuscript, audio