"Borrowing from the Bible is couched in philosophical terminology like preconditions of intelligibility. In brief, it is when a worldview cannot account for something that is foundational."- World religions and cults vol 3 p. 24. An example, when atheists say "your God is evil", they have no basis in their worldview to say anything is evil. In a naturalistic darwinian worldview there is no ultimate standard to say something is evil because in a godless universe it's just one opinion over another. What one person says is evil another person thinks is good. Hitler thought he was doing a good thing with the holocaust. The holocaust was a terrible thing but only in the Biblical worldview can that be truly said that the holocaust was evil because all morality comes from God, Isaiah 45:19 God said "I, the Lord, speak righteousness, Declaring things that are upright." Only because God has spoken, thats the reason why we have moral absolutes. Atheists have to borrow from the Biblical worldview to attack it. This is just part of what is called the methodology of presuppositional apologetics.