One of the most loosely used words in modern English is the term Christian.
It has been applied to almost everyone from the faithful member of the church, to the non-religious moral man, who holds as his greatest attributes that he provides for his family & doesn't mistreat his wife.
In this present generation multiplied thousands who consider themselves Christians, have no idea what the Bible actually teaches on this vital subject.
Merely believing in Christ does not make one a child of God, but rather gives us power to become sons of God. Afterall, the devils believe also, & trembles.
Jesus said, not everyone who saith to me Lord Lord, shall enter into the kingdom of Heaven, but he that doeth the will of my Father which is in Heaven. Matt. 7:21
Many wicked rulers also believed on Him (Jesus) but did not confess Him, because they loved the praise of men more than the praise of God. John 12:42-43
The term Christian is used in the Bible to refer to active, obedient followers of Jesus Christ. Not to describe anyone that calls themselves a Christian.
Jesus said if you love me, keep my commandments. Christians show their faith in God by the works they do. Not by words coming from their mouth.
God Bless.