The Supremacy of Christ and Aren't All Religions the Same?

Tim Keller, in his fantastic book The Reason for God, shares:

"I was once invited to be the Christian representative in a panel discussion at a local college along with a Jewish rabbi and a Muslim imam. The panelists were asked to discuss the differences among religions. The conversation was courteous, intelligent, and respectful in tone. Each speaker affirmed that there were significant irreconcilable differences between the major faiths.

A case in point was the person of Jesus. We all agreed on the statements: 'If Christians are right about Jesus being God, then Muslims and Jews fail in a serious way to to love God as God really is, but if Muslims and Jews are right that Jesus is not God but rather a teacher or prophet, then Christians fail in a serious way to love God as God really is.'

The bottom line was - we couldn't all be equally right about the nature of God."

The Son is the image of the invisible God, the firstborn over all creation. For in him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things have been created through him and for him. He is before all things, and in him all things hold together. And he is the head of the body, the church; he is the beginning and the firstborn from among the dead, so that in everything he might have the supremacy. For God was pleased to have all his fullness dwell in him, and through him to reconcile to himself all things, whether things on earth or things in heaven, by making peace through his blood, shed on the cross. -Colossians 1:15-20