Canaan is the ancient name for the land between the Jordan and the Mediterranean, and its own religion is known in two very different ways.
The first is polemic. Large parts of the Hebrew Bible are written against the cult of Baal and the worship of Asherah, and the writers are not describing a foreign religion so much as a domestic one they want stopped. That is a difficult kind of evidence: it is detailed, hostile and internal, and it tells you what the reformers objected to rather than what most people did.
The second is direct. Tablets excavated from 1929 at Ras Shamra on the Syrian coast, the ancient city of Ugarit, carry mythological poems in a Northwest Semitic language close to Hebrew, written down in the fourteenth and thirteenth centuries BCE. They present El as an aged high god with a consort, Baal as a storm god who fights the sea and then death itself, and Anat as a violent goddess who acts on his behalf. The parallels with biblical language are extensive, down to shared formulas and shared epithets.
Mark Smith's work on the material argues that the God of Israel emerges from within this world rather than in opposition to it from outside, absorbing titles and imagery from El in particular, and that the sharp distinction the biblical writers draw is the outcome of a long internal development rather than its starting point.