There were several major ethnic and racial groups living in East Harlem at the turn of the century that practiced various religions. Protestantism was practiced by many white Anglo-Saxon immigrants including Irish immigrants and others, such as the Blacks. Blacks mainly belonged to the Baptist and Methodist denominations or followed the occult. Catholicism was practiced by many people of different ethnic and racial groups. This book will focus on the variations practiced by the Irish Catholics and the Italian Catholics in East Harlem. Judaism will be explored for an understanding of the impact of Reform Judaism, Conservative Judaism and Orthodox Judaism. The purpose of this book is to show how the various religions were the focal point of each group, and how each group had to adjust the manner in which they practiced their religions in order to be accepted as Americans in their new environment. The essay will also show how the various groups introduced forms of the social gospel. In addition it will explain how the various groups were able to provide each individual with an identity which defined his role within the larger community of Harlem between 1880 and 1935.