Everyone who believes that Jesus is the Christ has been born of God, and everyone who loves the parent loves the child.
References for 1 John 5:1
By this we know that we love the children of God, when we love God and obey his commandments.
For the love of God is this, that we obey his commandments. And his commandments are not burdensome,
for whatever is born of God conquers the world. And this is the victory that conquers the world, our faith.
Who is it that conquers the world but the one who believes that Jesus is the Son of God?
This is the one who came by water and blood, Jesus Christ, not with the water only but with the water and the blood. And the Spirit is the one that testifies, for the Spirit is the truth.
There are three that testify:
References for 1 John 5:7
the Spirit and the water and the blood, and these three agree.