I believe that having Faith will make you more able, and willing, to survive. I don't care what faith you are, from Christian to Jewish to Pastfarian. Having a faith that helps to keep you focused on not just what is going on right now but what comes after lifts you from what you are going through mentally, and sometimes physicly.
There are people who have gone through the most horrendous things that have come out the other side with their faith intact. Many of them had their faith strengthened because of their ordeal. Many people have found a faith within them as they went through the ordeal.
Even if it just the faith in your own skills, have faith. It will make your survival easier.