If you are a Christian, someone who believes in Jesus Christ, you are a Christian, God’s child born His Spirit through the finished work of Christ.
If the world mockingly calls you a Christian, be proud of Christ’ finished work. Do not try to denominate yourself as if you’re hiding from being associated with Christ. It’s either we’re in or we’re out. As Christians, we’re not out, we’re in because God has put us in Christ even before the world ever was. This reality was manifested to our knowing by God’s grace bringing the knowledge of salvation to us at the proper time.
If you’re being called a Christian, rejoice. For what God has done through Christ to us and for us, He will not undo.
Father, thank you. Jesus, thank you. Holy Spirit, thank you.