How to Undercut Christianity at a Fundamental Level
In my book The Christian Delusion: Why Faith Fails
If we want to change the mind of the believer then the most effective way is to drive a wedge between their arguments for the existence of God (i.e., natural theology) and the other things they believe based in the Bible.
Once we do this the believer will see very soon afterward that those arguments for God's existence don't make a good case. What I'm doing undercuts their faith at the most fundamental level.
And so first we must make them liberals, then agnostics and then atheists. If we attempt to argue them from Christianity to atheism in one fell swoop we will not do it.