DNF. Reading this book is like eating a succulent steak sandwich... but the bread is made of cardboard. The content is absolutely incredible. But it is so dry! It reads like a textbook.
I finished the Judaism section, got part way through Christianity, and never reached Islam.
Judaism: Moses didn't exist, the exodus from Egypt didn't happen, there was no living in the mountains, Joshua didn't exist, nor did he lead the Jews to conquer the Cannanites and unite Israel and Judea as a single Kingdom. The origins of the Old Testament is a mix of existing myths put together by King Josiah in ~700BCE as propaganda to justify his own rule. He was a vassal ruler for the Assyrians. Then, there is like, 700 years of invasions, vassal statehood, and finally independence (Hasmonean Kingdom). Judaism forms a state religion across this period. Then the Romans take over and massacre the Jewish population and destroy the temple, converting Judaism into the scholarly Rabbinic Judaism of the Jewish diaspora.
Christianity: Emerges from the "Joshua" (meaning: "Salvation") cults in response to brutal oppression by Herod and Roman Empire. Jesus (Joshua) did not exist. Ninteen out of the twenty-seven gospels are forgeries (this is accepted by biblical scholars, not that the church ever tells you that!). The church emerges on top of synagogues and develops a system of mutual aid and charity. This is recognized as useful by the Romans, who eventually bring it in as a state religion. Most of the revolutionsry and communistic elements of Christianity are purged, with the Catholic church playing a particularly pernicious role.
Islam: I did not get there unfortunately :( Probably will come back to this in the future, but I have enough on my plate for further reading on Judaism and Christianity.
Overall, reading this book has pointed out a lot of future reading: St Paul's letters, Book of Enoch, Dead Sea Scrolls, the Essenes, the Maccabean Revolt, and the Roman Empire's rise and fall. Oh, also, Kautsky's "Origins of Christianity".
My conclusion is this is an excellent reference book, but certainly not a cover-to-cover read.