According to 1 John 5:4, what is the victory that has overcome the world?

Answer: Our faith

Everyone born of God overcomes the world, and the victory that has overcome the world is our faith.

“because everyone born of God overcomes the world. And this is the victory that has overcome the world: our faith. Who then overcomes the world? Only he who believes that Jesus is the Son of God.”— 1 John 5:4-5 (BSB)