Martin Luther would not discuss anything with people who didn't accept Scripture as the final authority.  Now, the the Naturalists will not discuss anything with people who don't accept Naturalism as a starting point for all thought.  If we start on a foundation of Naturalism, then everything is merely a matter of opinion.  Once we compromise on the God's Word, we can still draw a line in the sand and say, this is my morality.  We know two things for certain about that line in the sand.  First, we know that it is an arbitrary line that we drew ourselves.  Second, we know that we can move that line any time we like and it is no more arbitrary than the first line we drew in the sand.  There is one other thing that we can know but we don't want to think about.  There is no limit to where that line can go.

So, we have people teaching in our Universities who are promoting the idea that it is fine to kill children up to quite an advanced age.  We have many people promoting perversion of the worst kind and the entire culture is following their reasoning--because without the Bible, there is no limit to where immorality can go.

The Authority Of God's Word