Yes, you can teach Ethics without involving Religion
Were the problems that led to the financial crisis of 2008 purely financial issues, or ethical issues? Consider, for instance, the practice of selling a product to someone that you know can’t afford it. Or consider lending someone money that you know they won’t be able to repay. Who is ultimately responsible for such practices, often referred to as “predatory lending”?
How do companies behave ethically toward the stockholder, the market and the customer? Perhaps by thinking long-term. Stockholders need to be aware of ethics as well.