Abraham, Moses, Jesus, and Muhammad are the primary windows through which the children of Abraham see God, learn, and reflect. This is the theme of this book, with emphasis on Islam and Christianity, the world's two largest religions who claim more than half of the world population as followers. This book highlights the articles of faith and practices in both religions. It also explores points of agreement and disagreement on the concept of God, the nature of Jesus and Muhammad, as well as, the concept of salvation. With more than four billion people calling themselves Christians and Muslims today, the readers are encouraged to explore and contribute on how to reach better understanding and dialogue between these two great religions which, in the author's opinion, is needed for world peace.