That may be true however the answer is both are monotheistic.
Christians believe in the Trinity that is the Father, Son and the Holy Spirit. Jews and muslims believe in God as a single being.
Some definitions of the word "monotheistic" claim that Christians, Jews and muslims all believe in God as a single entity. That's not correct.
Thanks
You don’t understand the Trinity if you think it means there are three Gods.
Uh...no.
This discussion of Christianity’s Trinity belief calls to mind St Patrick and his shamrock analogy. Similarly, a die (dice) has six sides but is nevertheless a single entity. Jesus said “I and the Father are one” (John 10:30).