I don’t know about religion as a factor.
Slavery is de facto result of inequality
Chattel slavery was invented by Arab muslims who regard them selves as the master race and all blacks as fit only for slavery regardless if a black is a muslim.
Equality inequality has noting to do with slavery in the ME, Africa and elsewhere. Making slavery about finance and other things is simply a way to divert and mitigate the actual issue: that chattel slavery exists, and the overwhelming majority of slaves are ‘owned’ by muslims whose authority come straight from the koran, hadiths and sunnahs.
Go look up and watch some YouTube videos on the trans Sahara slave trade.......