There is no one answer to this question. There are several possible explanations. One reason may be that the early followers of Jesus were mainly Gentile people, and the Jews viewed Gentiles as strange and newly arrived creatures who were not completely devoted to God. So by calling them Christians, the Jews may have implied that they were still devoted to God even though they followed a strange god named Christ. Another possibility is that the name “Christian” was originally a term used by pagan worshippers in the region around Jerusalem to refer to themselves. When these pagans heard about Jesus’ teachings and began following him, the Jewish people started calling them Christians because it was a more accurate description of their beliefs.