Being raised in a society that has its roots in the “Christian” faith does not make someone a “Christian.”
Going to church does not make someone “Christian.”
It is in their behavior and their actions. If they reflect God they will honor God and they must work within the boundaries of the Bible.
It is by asking Jesus to be your savior and committing your life to following all the teachings of the Bible.
It is saying that a sin is a sin and willing to repent, meaning abandon this sin for the glory of God.
That is what it means to be a “Christian.”
When someone says they are “Christian” and would rather gain wealth, rather talk about sports and the latest gossip going on with celebrities. That is called hypocrisy, a sin against God and actually the ultimate insult to Him.
Christ hates it so much he had this to about it:
Revelation 3:15 I know thy works, that thou art neither cold nor hot: I would thou wert cold or hot. 16 So then because thou art lukewarm, and neither cold nor hot, I will spue thee out of my mouth. 17 Because thou sayest, I am rich, and increased with goods, and have need of nothing; and knowest not that thou art wretched, and miserable, and poor, and blind, and naked: 18 I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see. 19 As many as I love, I rebuke and chasten: be zealous therefore, and repent.