Correct me if I'm wrong but wasn't Baal the god of the sun, fertility, and flocks according to the beliefs of certain ancient Semitic peoples? Wasn't he worshipped by the Carthaginians? They may have sacrificed their children to him but that was their ignorance (they believed their sacrificed babies would spend all eternity in the blissful paradise of the Sun god, right?), it doesn't seem to be an act of malice. It may be Idoltry but using the name doesn't imply that one is a believer in the false god.
Enough with this rubbish and back to the task at hand.
Baal was a pagan god. Yes he WAS the god of the sun as you said, but that's just an example of what he WAS. As said semitic peoples refocussed on monoteheism (Zoroastrians are credited with first recognizing monotheism, they still practice to this day, but number only in the hundreds of thousands)
And the semites dropped the pagan gods that they picked up from their nomadic lifestyle from Akkadia. Baal later became known as Beelzebub (Baalzebub) who we refer to as Satan now. Cast out of Heaven.
It is also important to know that "Baal" is a title. So no one "given" deity held the name. However, it is worth noting that the title was given to the (semi-political) opposing (leading) god of Yaweh. One either held God or Baal. So Baal was in opposition to God.
Also, it must be pointed out that Baal having changed to Satan became the enemy of Jesus, tempting him in the wilderness.