I believe Chalcedon has some pretty good articles concerning this topic so I'll just give a link here.

“Gay Marriage”: What’s It to You?

After witnessing the downfall of a whole PCUSA church to total Liberalism. I have serious doubts about reform in the mainline evangelical churches. As an advocate for conservative, reformed, biblical theology in the PCUSA, I was perceived as oppressive, intolerant, self-righteous, rigid, close-minded and an arrogant know-it-all. To stand up and declare God's absolute truth is almost impossible in today's post-modern society where relativism rules the day. What was really discouraging was the fact that after months of presenting the reformed view, sending e-mails, personal meetings, long discussions, holding reformed classes involving Sproul tape series, after doing all this, not one person in the whole church has become reformed. This is a pretty big church mind you. So after trying very hard to bring some biblical stability in that PCUSA church, I had to leave it for the sake of my family.

Now I find that I am still being an apologist for the reformed faith in the PCA church we're now attending. It isn't as nearly as bad as the PCUSA in liberalness, but there are recognizable strands of Humanist, Relativist, Autonomous, Post-Modern thinking even in the PCA. Although, I haven't heard anyone advocate homosexuality in the PCA, like several people did in the PCUSA, It's sad to say that I wouldn't be surprised if I did.

This is one reason that I've really enjoyed Francis Schaeffer's works. He along with other good authors have really helped me in understanding what is going on in our society and the church today. It's a shame that so many are blinded to the importance of what's going on.

Dave.

Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified. - Galatians 2:16