Modern day Pharisee. And an imbecile really.

The way to speak the truth in love to those who have the Koran, and those who are Muslems, is to simply share the Gospel. The same gospel that saved filthy sinners like us.
Paul said, "And you were dead in the trespasses and sins in which you once walked, following the course of this world, following the prince of the power of the air, the spirit that is now at work in the sons of disobedience—among whom we all once lived in the passions of our flesh, carrying out the desires of the body and the mind, and were by nature children of wrath, like the rest of mankind."

So we are all sinners, and children of God's wrath.

Then Paul said this, " But God, being rich in mercy, because of the great love with which he loved us, even when we were dead in our trespasses, made us alive together with Christ—by grace you have been saved"

We need to know we are sinners, and that Christ is the Lamb of God, who takes away the sin of the World.
We need to repent and trust in the Father, who sent the Son.

We share this truth with all men and women. And when a Muslem hears this truth, and is convinced in his heart that this is true, then he will put away his Koran, and he will become a child of God, as we are.