I appreciate the suggestion but that wouldn't really work with the scene. There isn't really anyone in the room to disagree with him.
As far as the overall story goes, the concept of destiny doesn't really come-up anywhere else; certainly not to the point where I can create a balanced argument about it.
Or the character could have been wrong about something in the past, so that readers already question him. Or you could have some other character spout utter nonsense like it's absolute truth, so that the reader doubts you as a writer (the right kind of doubt, not the bad kind).