The Christian is Unlike Everyone Who is Not a Christian
The Christian is supposed to be different.
If a Christian’s life blends in with the lives of non-Christians, then they are not living as a Christian should.
The gospel of Jesus Christ creates a clear-cut division and distinction between the Christian and the non-Christian. - Lloyd-Jones, Studies in the Sermon on the Mount
Jesus’s ministry and message would result in a division - a dividing of people from the rest of the people in the world.
Do not think that I came to bring peace on earth. I did not come to bring peace but a sword. For I have come to 'SET A MAN AGAINST HIS FATHER, A DAUGHTER AGAINST HER MOTHER, AND A DAUGHTER-IN-LAW AGAINST HER MOTHER-IN-LAW'; and 'A MAN'S ENEMIES WILL BE THOSE OF HIS OWN HOUSEHOLD.' He who loves father or mother more than Me is not worthy of Me. And he who loves son or daughter more than Me is not worthy of Me. And he who does not take his cross and follow after Me is not worthy of Me. He who finds his life will lose it, and he who loses his life for My sake will find it. (Matthew 10:34-39)
Picking up your cross and following Jesus means you will be different from the rest of the world. Because you will be different means the world will no longer be your friend.
The peacemakers will be persecuted by others in the world (Matthew 5:10-11).
Why?
Because the world hates Jesus - it hates His message and what He stands for.
If the world hates you, you know that it hated Me before it hated you. (John 15:18)
The world will persecute, in some form, those who “desire to live godly in Christ Jesus” (2 Timothy 3:12).
Christians do not seek to stir up strife (2 Timothy 2:24-26), but they will live a life that the world will hate.
The world hated Jesus - and the Christian is called to live like Jesus. Why would the world react any differently to those living like the Lord?