Ordinarily, slaves were forcibly converted to Christianity as their masters believed it was necessary to "uplift them from savagery" or whatever. However, some (though obviously not a majority as some antisemitic black nationalists would claim) slaveowners were Jewish, and Judaism doesn't engage in proselytization. Were these slaves allowed to continue to practice traditional West African religions, or were they taught Christianity anyway even though their owners weren't Christian because it was just "the done thing", or what?