Ethics is not just abortion and euthanasia and just war theory. Ethics is living and thinking the good life. It is a really good way in to sharing the gospel. I wrote an introduction to Christianity built around ethical questions, that I haven't looked at for some time, but I remember being good.
The assumption is that some people don't want to know what you believe as a Christian, they may want to walk in your worldview... but they are interested in just thinking about how to live well. This is a good way in.
Jolly and I are are planning to preach about a bunch of ethical topics at Tuesday Crossroads starting in July. We are trying to nail down the topics and come up with snazzy titles, perhaps with a bit of an advertising slogan/adjamming sort of spin. Can you help?
Selfimage (including being a part of a subculture too)
Success
Drugs/alcohol
Romance
Technology (including control, power and self-discipline)
Materialism
Good deeds
Sex