Several religions believe in the existence of only one God: Judaism, Christianity, Islam, etc.

But is the God worshiped by Christians the same as the God worshiped by followers of one of the other monotheistic religions?

2 answers

If there's only one God, the same one must be worshipped by all monotheistic religions.

Polytheists might say they worship different gods.
Keep in mind that all three monotheistic religions trace their faith back to Abraham in the Torah or Old Testament.