It’s common in Christian circles to limit our preaching and teaching to Christ’s ability to take care of our sin problem and fix our broken lives. That is the Gospel message, but that’s not all Christianity has to say about the world in which we live. Christianity is total truth. It’s not just truth about salvation, it’s also truth about science, morality, and insofar as morality should affect society, politics as well. The Christian worldview affects every area of life, both private and public.
Unfortunately the church has typically limited its preaching and teaching to issues surrounding the private life. We have ignored socio-moral issues such as abortion, embryonic stem cell research, same-sex marriage, cloning, etc. If they are addressed at all, it will be with a passing condemnation that lacks both intellectual substance and explanation. I think our lack of dialogue on these issues explains why our socio-political influence is disproportionate to our numbers.