The point of Jesus' death was to pay for our sin. We all sin and no one (except Jesus) has led a perfect life. You only need to look at one of the papers to see that.
It was by Jesus's sacrifice of himself that my sin has been paid for. I wonder who Professor Dawkins wishes to pay for his own sin- it'll either be himself or Jesus.
And there are plenty of Christians, like myself, who were not brought up in it.
St Andrews, Fife