Usborne books has an Encyclopedia of Religions that is beautiful. It talks about all different types and subtypes. It points you in the direction of ACURATE websites for each religion too. I am not an active consultant right now, but there is probably one on this message board. Or, someitmes barnes and noble has it.
As for health, I love my Herbal Home Healthcare book by Dr. Christopher
www.snh.cc is one place you can get it.