A History of God: The 4,000-Year Quest of Judaism, Christianity, and Islam

Book: A history of God
Author: Karen Armstrong
Info: God as explained by philosophers, mystics of Judaism, Christianity and Islam.

Review:
I took a lot of time to finish this book, and truth is that it is not an easy book to read. Parts in the book which highlight work of Muslim philosophers, mystics and other personalities were easier as there names sound familiar to me.
To enjoy this book, either you should have good knowledge of historical figures who contributed in  Judaism, Christianity and Islam or else you should prepare yourself for a lot of googling.
I must say that after reading this book, i learned many new things and it made me think about God in a different way, it helped me in better understanding of my God. Those interested in the religion, philosophy, Mysticism should read this book. For the first time i realized remarkable similarities in the three Abrahamic religions, and specially the similarities in Islam and Judaism.

Here is a review by Gohar: http://www.goodreads.com/review/show/1413757549

Inter-religion Similarities

Today when we look at prevailing rituals in different religions, we realise the similarities between them, irrespective of the monotheistic or polytheistic religious philosophy.
I believe the reason behind it is that every religion which exist now or the religions which are dead now, they all got the basic learning of their belief from one common source, a source which is known by different names in different religions.
Monotheist believe in one God, and that one God of monotheist is also at the core of polytheistic religion, only difference being that human since birth are prone to believe on things which they can physically see, to make them sound more confident of their belief they started creating Gods and Goddesses for their every need. This lack of faith gave rise to mythical stories related to Gods, which ultimately paved way for mythical religion of past and present.
Going by the concept of monotheistic belief i can say that since beginning of time there was only God, and that God conveyed the same message to every human through His prophets, messengers, saints etc. Human due to their lack of understanding and faith, started creating their own Gods and forgot the teaching of that one God which were conveyed to them by their ancestors.  I feel this is the primary reason that today we see the similarities in various rituals performed by the followers of different religions.