Interesting program on Radio National's Spirit of things with Rachael Kohn, "The Buddhist Atheist" The thing that I found interesting and was how within Buddhism there are those who struggle; that are more 'left' leaning for want of a better word.
The interview is with Buddhist Author and former monk Stephen Bachelor, who doubts reincarnation. It is similar to how liberal Christian often doubt the virgin birth or the atonement etc etc.
What I found interesting is that I think within most major religion there are those that doubt. Who don't fit into the orthodox.