What do the three Abrahamic faiths-Christianity, Islam, and Judaism-have in common?

Question

kenljw · Answer

Monotheism, though initial Hebrew didn't deny other gods they only worshiped one, see 1st commandment.  Even though Christianity use the trinity as their monotheistic God I disagree, I consider it having two Deity's the Father and the Son, see the end of Revelation where a temple is built for both.  Islam is like the Hebrew in only worshipping one God.

anonymous · Answer

also hold jerusalem to be a holy city
claim descendency through the old testament --- abraham's god is the same god Jesus mentions is the same god of islam