If you're looking for a black and white one size fits all answer, there just isn't one. Faith is immensely personal.

Of course it can be helpful. Anything that gives someone hope, and helps them keep going and not give up, is helpful in a survival situation.

Then again, if someone puts their faith solely in a miracle when there is something they can do something to help themselves survive, IMO, that's not helpful.

IMO, your answer comes down to will. If your will is to survive, your faith will be helpful, whether it's faith in a higher power, faith in who you are with, faith in who you count on to rescue you, faith in your equipment, faith in science, or faith in yourself.