Well the 2 are just a spin off from the Judaism...... Its like the holy trinity of mythology ..the Father (Jewish) the son (Christianity) and the Holyshit (Islam).... When you have a Religion that says convert or DIE with a large army behind it, and the leaders of the time using it to exsploit the poor. You get this perfect storm. You can tell who had the stronger armies back then .The religion of that people survived... for example the Hindu religion come from a region that had a strong military so that religion survived.
Did I make a good point? thumbs up I cant help it I'm a Kudos whore. P.S. Jesus is a MYTH.