This is one marvelous essay and book review, written by
Spengler , revealing why Islam is irreconcilable with the Covenenant faiths - Judaism and Christianity.
It is somewhat difficult to read, but worthwhile if you can stay with it.
It exposes Islam for what it really is - a pagan cult to protect ancient primitive tribal blood feuds among families who practice incest.
The Closing of the Muslim Mind: How Intellectual Suicide Created the Modern Islamist Crisis
by Robert R Reilly