No. I actually get more comfort now knowing there is no lunatic god than I did when I believed there probably was one. There is no fixer in the sky who can make a loved one better. To beg a god to fix a problem he obviously knew was coming and yet allowed to happen is ridiculous. I don't think people understand what it means to pray to a god, say, of an Abrahamic bent.
Best to take comfort in friends, family and your own independent intelligence. Or if you insist on praying, then do it to a milk-jug... it will give the same results.
Not at all. In times like that you have to trust in the doctors doing their job. It's nonsense to even think like that. If others are doing it, it's probably not a good time to tell them that. You can hope but shit happens and death is inevitable, no matter how painful it may be.