Why Did Israel Always Go Back to Baal Worship?First of all just like everyone, Israel had a sinful heart. Just like any other human being they sin and commit mistakes.
One of the reasons why they also go after Baal is because of the land and climate in Israel. Israel you see is an agricultural country. During Old Testament times, they depend so much in the rain that when drought comes, hunger follows.
Since Baal is a god of rain, the Israelites adopted this idol readily. Instead of putting their heart and trust in the real God, they turn to Baal thinking that the latter will readily give them rain.
Baal was then unmasked as a false God when Elijah squared off with Baal prophets in 1 Kings 18:22-40.