I'm very confused to see this film and cast away

Rating: 7/10 (7 March 2006)

I am very confused because in the "cast away" Zemeckis have made a film that believes in the destiny that is programmed by god but in this movie the doctor have been survived after he had died because of the notes from Marty and the destiny has been changed. what do you think because of i had seen cast away before this , i expect in the meanwhile of watching movie that the doctor will read the message of Marty in 1955 , but any way he will die because this is the destiny and i was so confused after seeing the doctor alive . in the cast away Tom Hanks was a on time man and because of an accident he casted away from civil and he had a new believe that all things are not in his hands and someone from "up" is programming for his life and at the end of film , when he was in the road he was at a four way road and he did not know to go from which way and the sight of camera was from "up" that seems Zemeckis is showing us someone in "up".
do you think that the believes of Zemeckis have been changed or something else?