I was reading the first letter of St John

and came across this preface
When you read this, you can’t help but think of those who claim to be Christians but do not follow Christ’s most importance teachings of Love, humility, sacrifice for others but rather preach war, mayhem and destruction in his name.
Here it is. You be the judge
The content of the letter focuses on authentic fellowship with God.
Faced with innovators who broke away from Christian orthodoxy, John's readers need assurance that they have embraced the true gospel that comes from the apostles.
He theretore stresses that they-and not other rival groups possess what was passed down from "the beginning" (1:1; 2:7, 13, 24; 3:11).
They are the ones whose faith is victorious (5:4) and whose fellowship with God is certain(1:3; 3:24), provided they walk in the light (1:7), confess their sins (1:9), keep the commandments (2:3), and love one another in word and deed (3:18).
The difference between true and false believers emerges as John divides the world into light and darkness
(1:5), truth and ertor (4:6), love and hate (2:10-11), life and death (3:14), Christ and the antichrists (2:22).
The line that runs between these contrasts is also the line that distinguishes the chíldren of God from the children of Satan (3:10).
At the height of all these reflections stands the triune God, who is light, life and love (1:5; 4:8; 5:11).
The fellow ship that believer enjoy with the Father rests on the grace of divine life that is given us by the Son (5:12) and abides in us by the indwelling of the Spirit (3:24) This gives Join the boldness to insist that we are truly "children of God" (3:1) born of the Father (3:9) for eternal life (5:13).