Reddit reviews The World's Religions, Revised and Updated: A Concise Introduction

Some nonfiction books I enjoyed that came to mind:

• Guns, Germs, and Steel by Jared Diamond
  
• The World’s Religions by Huston Smith
  
• Science In The Looking Glass by E. Brian Davies
  
• The Butchering Art by Lindsey Fitzharris
  
• Head In The Cloud by William Poundstone
  
• The Future Of An Illusion by Sigmund Frued
  
• The Meaning Of Human Existence by Edward O. Wilson
  
• The Rape Of Nanking by Iris Chang

A religion is a complex social structure, much more than just its founding text. That said, the texts are themselves very complex artifacts with a long (and murky) history, plus layers and layers of interpretation and commentary. But if you are only a "budding" psychologist, you should definitely start with one of the survey books like Huston Smith's The World's Religions. That will give you a better overview of the major religions and you can decide which (if any) are worth spending your time on studying.

If you want to know more, from a solid academic perspective, I suggest http://www.amazon.com/Worlds-Religions-Revised-Updated-ebook/dp/B004I43MPE It's a well written book that is an extremely common textbook for Introduction to World Religions classes in colleges for 30+ years now. Smith's book on Christianity is also great. You should be able to get either through your local library, or online for pennies (plus shipping).