Basically what you said. about he and Semiramis being worshipped in ancient Babylon. Can’t find it in the Bible
Nimrod is mentioned in the Bible as the great-grandson of Noah and the son of Cush. More here about him.
http://en.wikipedia.org/wiki/Nimrod
“In some versions (as in Flavius Josephus), Nimrod is a man who sets his will against that of God. In others, he proclaims himself a god and is worshipped as such by his subjects, sometimes with his consort Semiramis worshipped as a goddess at his side. (See also Ninus.)”
Women usually aren’t mentioned in the Bible unless they’ve played some direct and important role.
Their son, Tammuz, was a Babylonian god and even one of the months of the Jewish calendar came to named after him!
http://koinonia-all.org/bible/nimrod.htm
Take the time to research the pagan origins of the American holidays like Easter, Christmas, Thanksgiving, and others and you’ll find they almost always lead back to them.