Yes the Jews were acknowledged to have discovered there was only 1 God. The Romans, Greeks Huns Vikings etc: etc: still worshiped multiple Gods usually based around seasons & weather. One God was intellectual progress for mankind.
This concept of "one god" is political "progress", not intellectual progress. The Judaic concept of "One Supreme God" was invented to cement an authoritarian and repressive rule by one group over a diverse people. It has been found highly useful by every other repressive authoritarian regime since, thus it's popularity.
"Worship" is a Judeo-Christian concept and is alien to paganism. That God should need or desire the worship of humans is a pretty damned stupid idea. It's like you needing the worship of each individual cell in your spleen. It's the height of conceit and an intellectual failure on a massive scale. It places a severe human limit on God.
Pagans did not "worship" gods / goddesses, they were fabricated personifications of natural forces. Propitiate? Perhaps. Evoke in ritual and magic to gain a desired end? Absolutely. "Worship"? No. That's a Judeo-Christian concept, and quite defective in my opinion.