If a man says, “I love God” and hates his brother he is a liar, because the person that does not love his brother that he has seen cannot love God who he has not seen, for we have this precept from Jesus, that ‘He who loves God will love his brother also.”
Whoever believes that Jesus is the Christ is born of God and every one that loves his Father loves his Brother.
This is how we recognize God’s children: They love God and keep His commandments. 1 John 4:20-21 & 5:1-2