Amen but keep reading.
all have sinned and fall short of the glory of God
Rom 3:23
All sinners need the blood of Christ to redeem their souls and fallen nature.
Remember that the snippet from First John you quoted was written to BELIEVERS against heresy.
It goes something exactly like:
15 Whoever confesses that Jesus is the Son of God, God abides in him, and he in God.
16 So we have come to know and to believe the love that God has for us. God is love, and whoever abides in love abides in God, and God abides in him.
I John 4