I'd rank my credibility at 5 because despite how true it is, I have nothing I can use against atheists except turning their arguments around. The Case for the Creator book is unhelpful.
Specifically, what are your opinions based on?
My opinions are based on what I see all around me, and where I get new scientific information from.
Have your attitudes changed over the years? If so, how? What prompted these changes?
My attitudes toward religion have slowly corroded ever since I first heard theories of evolution and the big bang, and worsened when I got into college. I felt helpless and defenseless, and the only way out, I found, was to turn arguments around, and I find comfort in the times in which God reveals Himself to me (though none of them can withstand scientific scrutiny). Despite what the author says, I believe God hides himself. It says so in Psalms.