If that were true then all Christians would love their neighbor.
But we can plainly see just from the evidence of this Christian forum and others that actually very few Christians have an intimate 'knowing' relationship with Christ. Christ knows them in salvation but they do not know him intimately.
He knows us before we know him intimately. We mature and grow up into that intimacy. We know we have matured to that level of intimacy
by if we are obedient to the command to love others.
"Everyone who loves has been born of God and knows God. 8Whoever does not love does not know God, because God is love."-1 John 4:7-8