God calls Christians to an odd kind of life — one that is lived in the present, transient world but lived for the future, eternal world.
Though some sects of Christianity take the "this is not our home" concept to an extreme and totally withdraw from the secular culture, God doesn't desire for his people to detach themselves from the morally neutral activities of this world. His instructions to the exiled Israelites are certainly applicable to us, the contemporary sojourners of God:
"Thus says the Lord of hosts, the God of Israel, to all the exiles whom I have sent into exile from Jerusalem to Babylon: Build houses and live in them; plant gardens and eat their produce. Take wives and have sons and daughters; take wives for your sons, and give your daughters in marriage, that they may bear sons and daughters; multiply there, and do not decrease. But seek the welfare of the city where I have sent you into exile, and pray to the Lord on its behalf, for in its welfare you will find your welfare." — Jeremiah 29:4-7