Ancestor worship is an obvious one. The near deification of the offspring of Adam and Eve, to the point of several religious factions fighting over Herod’s temple to pray above the bones.
There are some Greek and Roman minor deities mixed into Early Jewish adornments of temples and tombs. The Goddess of Victory is in a fresco in the Jewish catacombs. An inscription in Dura Europos Synagogue contains an inscription to the Greek goddess Tyche. In the same synagogue the goddess Aphrodite takes Moses out of his basket and gives him to some nymphs that will raise him.
Not part of the art, but important to note:
God has many names, which indicates the number of times a new culture was assimilated into Christianity — how many tribes joined together by marriage or war, and then cooperated by adding the old god to the new religion.