I would heartily recommend the book "How to Become a Really Good Pain in the Ass" by Christopher DiCarlo. It is a "Critical Thinkers Guide to Asking the Right Questions". The author is lecture on bioethics and philosophy of science, fellow and advisor of the Society of Ontario Freethinkers and Center for Inquiry. It is entertaining and always informative covering the development of skepticism during the time of Socrates to now. He goes through the main cognitive fallacies in a delightful insightful way. His analysis of how arguments are put together will help in becoming a really good "Pain in the Ass". He then goes into the big 5 questions of life, existence etc. and compares and contrasts natural mind to the supernatural mind. This is a real education and I highly recommend it. It will definitely go into the must read list. It published by Prometheus Books.
Peace Skeptical DoDo