You're right, my mistake. I had it in my head that Zoroastrianism was first, then looked up its origins to get a date, but didn't double-check it. It looks like Judaism pre-dates Zoroastrianism by a couple centuries, and Atenism (emerging in the 14th century BC) preceded both.

The argument still stands. We're still talking about 4 millennia of monotheism, preceded by 200 millennia of various other forms of religion.