All too often, critics of the incarnation dismiss the idea because it seems inconsistent with their understanding of God. These critics, however, seem to know exactly what God is like, and on the basis of this idea of God, reject the incarnation. But on what basis do they establish this idea of God? What source of knowledge do they possess which is denied to everyone else, and which is more reliable than the knowledge of God to be had in Jesus Christ? All too often, criticisms of the incarnation boil down to the simple, and not very significant, statement that someone somewhere has an idea of God which is inconsistent with the idea of the incarnation. But so what? Unless he can prove, beyond all reasonable doubt, that God is really like that, his criticism is not important.
— Alister McGrath, from Understanding Jesus, p. 111