Here's a list of scholarly books I can recommend on the Bible.
These focus on the Christ myth theory - that Jesus was originally a fictional/mythical figure and only later was historicized:
- The Christ Myth Theory and Its Problems - Robert M. Price.
- Jesus: Neither God Nor Man - Earl Doherty.
- Beyond the Quest for the Historical Jesus - Thomas L. Brodie.
- The Jesus Mysteries – Timothy Freke and Peter Gandy.
- Nailed: Ten Christian Myths That Show Jesus Never Existed At All - David Fitzgerald.
- The Jesus of the Early Christians: A Study in Christian Origins - G.A. Wells.
- The Christ Conspiracy: The Greatest Story Ever Sold – Acharya S.
- The Pagan Christ – Tom Harper.
- The Incredible Shrinking Son of Man – Robert M. Price.
- The Jesus Puzzle – Earl Doherty.
- Suns of God: Krishna, Buddha and Christ Unveiled - Acharya S.
- Christ in Egypt: The Horus-Jesus Connection - Acharya S.
- Who Was Jesus? Fingerprints of the Christ - Acharya S.
- Jesus and the Lost Goddess – Timothy Freke and Peter Gandy.
- The Laughing Jesus – Timothy Freke and Peter Gandy.
- The Jesus Legend – G.A. Wells.
