People don't realize that God set the Hebrews against the Canaanites for doing the very things that the secularists are promoting now -- idol worshipping, sexual immorality, and woman and child abuse. Also slavery, which I don't believe has ever been a Jewish custom, in principle if not in practice.
Not really true. The Jews had lots of slaves, as did Abraham and the other patriarchs. All ancient peoples practiced slavery and took it completely for granted. Even the NT accepts it, to the extent that Paul counseled a runaway slave to voluntarily return to his master.
The OT did spell out rules for how slaves were to be treated, and all Jewish slaves were to be freed every seventh year. This meant that Jewish slavery was more like indentured servitude for a specific period than the lifetime chattel slavery we think of.
Apparently this provision was not always followed, and it doesn't seem to have ever applied to non-Jewish slaves.
The concept that there should be NO slaves did, however, evolve out of the "all men are brothers" idea created by the Jews.