One can use whatever ever they like, it's a free country
But Christians are called Christians because they follow the teachings and example of Jesus Christ. The term "Christian" was first used in the ancient city of Antioch, where followers of Jesus were called "Christians" because they were seen as being like Christ or followers of Christ. The name eventually stuck and has been used to describe followers of Jesus
Christ ever since. Being a real Christian involves believing in the teachings of Jesus, living according to his principles of love, compassion, and forgiveness, and seeking to emulate his example in daily life.
