Download or read book Catholicism written by Gerald O'Collins and published by Oxford University Press. This book was released on 2017 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the topics covered in this introduction to the largest and oldest institution in the world are the origins of the Catholic Church, how Catholicism has changed and adapted over the centuries and the challenges the Catholic Church faces in the 21st century.