The thing about destiny is that it could be scientific. Free will is a chemical reaction, and because we don't get to replay choices we have no idea whether our choices are actually "choices" at all. If everything that happens is pre-determined and predictable through the movements of atoms or whatever lies below them, then destiny falls into place perfectly.
Of course it's all speculation so I don't believe in it until I see some evidence. The reasoning is there though.
Of course it's all speculation so I don't believe in it until I see some evidence. The reasoning is there though.