["How widespread was the pagan baal cult in the ancient world circa 1000 bc?..."]
...'Ba'al is a title applied to several different localized Western Semitic Fertility cult deities - Hebrew prophets see them all as one big monstrous abomination, which is correct.
The best movie version showing what a fertility cult world is like is Mel Gibson's Apocalypto. Both Mayans and Aztecs practiced human sacrifice fertility cults, as did a number of other American Indian tribes, many Polynesians, some southeast Asians, and a number of sub-Saharan Africans.
As Christianity - which is the force that ended all those fertility cult abominations around the globe - has become effeminate, limp-wristed, and defensively determined to see great good in all other religions and cultures, child sacrifice has been making a comeback.