I do think there is a lot to be said about positive thinking. It does work. I am not just talking about positive beliefs in God but in other things too.
I am a Nurse Assistant and I have worked with thousands of cancer patients and other terminally ill over the last 12 years and those who maintain a positve attitude always live much longer than those who do not. Many when they think they have a death sentence just give up on life. My mom died of cancer too but she live 10 years with it and only got really bad a few months before she died. Up until then, she looked and acted perfectly normal and healthy. she refused to allow it to ruin whatever time she had left. She lived 10 years after the doctors gave her six months. My dad who had cancer was the opposite. Although his prognosis was good, he did not handle cancer well, he always was negative anyway and he died in three months after his diagnosis. He should have gone into remission the docs. said. So I believe there is something for positive thinking.
Also those who are negative get sick much more often. I have seen studies on this.
I also have read reports that those who have a belief in a higher power, live longer, less stressful lives.
I believe in God but also believe in good energy and I refuse to associate with any negative people because they make me feel so much stress. And they put off a bad energy field, as I call it.