This is happening because many people that labeled themselves themselves as such no longer do, though our views have not changed. What was a "conservative" in the 70s is no longer what is a conservative today. At one time conservatives supported smaller government, less government interference in our lives and more personal freedoms. Today's conservatives support none of those things.
The same holds true for Christians, or ones that used to call themselves that. The Church in America today is more about politics than religion and many people that used to attend no longer do, but they still hold the same faith.
Liberals have moved on to subjects that challenge traditional morality.
Are churches supposed to ignore this, and if so, why?
Define "traditional morality"
NO. YOu're being silly.
No, I am not. I am asking you to define a term that you used. Why is it you are not able to do so? What are you afraid of?
Also, biblically speaking, should the focus of the church be what liberals are doing or the Word of God?
I am able to do so, I just don't find it credible that you need it. I think that you read a general statement, and want to bog the thread down in details and semantic arguments, instead of addressing a point, that you know is true, but don't want to admit to.