Link
There was an interesting item on public radio about ethics in business and why high ethical standards are to the benefit of all, (shareholders, employees, customers etc) by William George the ex-CEO of Medtronic. You can listen to the lecture at the following:
http://news.mpr.org/programs/midday/
Being religious does not necessarily mean having good ethics. I don't think it is ethically right to amputate peoples limbs as a punishment though some deeply religious people may disagree. Christianity has often lagged behind ethical reforms and many have used the Bible (and religion) to justify slavery, segregation and sexism. That's not say that deeply religious people weren't involved in forming the ethical standards we expect and accept today but means that relgion is not necessarily a good force in people's lives.
I believe you set your own standards and do business with those whose code of conduct and ethical standards match yours or your company's.
Thirdson