It's hard to imagine big businesses we have to day given that the predominant religion of the Western world (where most of them are) is Christianity which is very negative on wealth and mistreatment of people. I suspect all this shows is the real "religion" of big business is "the worship of the rapid accumulation of money" -- I doubt things would be any different no matter what the religion of the area was so long as the "religion" of business was really money.
I would have to question if those responsible for the mistreatment of people and the distruction of the earth in order to attain wealth consider themselves following true christian ethics. I am not saying that Christianity has changed to allow this. You are probably right that some of the followers of any religion would have done the same. I am just thinking idealistically