The term Christian is a very broad term. Most of the Western world was at one stage called Christian. Yet Christians were at war with one another in many parts of the world. Catholics and Protestants killed one another in the name of their God and justified themselves. British soldiers and Boer soldiers prayed to the same God before shooting one another. Something is wrong with our definition of a Christian. The Biblical definition means that someone believes in, trusts in and lives the same way as Christ and in fact is acting as a small Christ in their community. Christ said: I am the way the truth and the life, no one comes to the Father but by me.
The Bible also states that when we are in Christ we are new creatures. Our core has undergone a supernatural change. We are born-again by the Holy Spirit. Our sin-nature has been put to death in Christ. All our hope is in Christ only.