Can one say the right thing in a wrong way?

Well, obviously one can. Here is a quite instructing example of it. What teleevangelist Bill Keller says in his video message to Osama bin Laden is indeed true generally, eventhough it is "spiced up" with american-style mass media tricks. But the point is: The effectiveness in spreading the Gospel is not brilliant rhetorics, not even a good-structured reasoning, but being just a humble messenger of God, spreading His word. No human being can save another, it has to be God himself, who reaches and touches the hard and stubborn hard of human beings. We only can be messengers.

Joh 6:44
(44) No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day.