The test
The apostle John writes,
"Dear children, do not let anyone lead you astray. He who does what is right is righteous, just as he is righteous.
He who does what is sinful is of the devil, because the devil has been sinning from the beginning. The reason the Son of God appeared was to destroy the devil's work.
No one who is born of God will continue to sin, because God's seed remains in him; he cannot go on sinning, because he has been born of God.
This is how we know who the children of God are and who the children of the devil are: Anyone who does not do what is right is not a child of God; nor is anyone who does not love his brother." 1 John 3:7-10.
Here is if you will the litmus test for someone who claims to be Christian.
1/ He does right.
2/ He does not sin.
John making it clear,
“This is how we know who the children of God are and who the children of the devil are: Anyone who does not do what is right is not a child of God; nor is anyone who does not love his brother." 1 John 3:10.
The way I see it this is how we should judge anyone who claims to be a Christian.
Please think about it.