Muslims believe the God they worship is the same God both Jews and Christians Worship - the differences come from the prophets

Islam rejects Jesus's Divinity and instead consider him a messenger of god - since Muhammad (also a messenger of God) arrived on the scene later his words take precedence over Jesus's

Christianity believes that their namesake was the son of God and as such his teachings are the direct word of God

Judaism rejects both Jesus and Muhammad as prophets

the core beliefs are the same (follow Gods code and lead a good life and be rewarded in the afterlife, deviate and you will be punished for all eternity) - this is what is refereed to as a "Death cult"

to use your Pizza analogy - all 3 Pizza's have ham, you are just arguing over how much ham is right...