This week Mary looks at how doubt and skepticism can be essential ingredients to faith.

We hear from Rabbi Rami Shapiro - a rabbi who says he isn't religious.

Instead, he describes himself as a curious, holy rascal in search of sacred cows to slaughter.

For more on our show and our guests...

Rabbi Rami Shapiro is currently Adjunct Professor of Religious Studies at Middle Tennessee State University

Also, a conversation with Michael Shermer, the founder of Skeptic Magazine. 

He tells Mary how he hammered Deepak Chopra (in his opinion) at a conference on consciousness and quantum physics.

He also explains how, for him, the mind does not exist. The brain is just electric meat.