English Art/Literary Religion Creationism

This book is about the decline of the Church’s view of Genesis 1–11, which has led to a catastrophic decline in believing in the absolute authority of the Word of God in the Church. Many Christian academics and church leaders have abandoned a literal understanding of Genesis, or have compromised part of Genesis, in their attempts to fit various aspects man’s historical science (beliefs) into the Bible [...]. Now many of these scholars are godly people who have a sincere burden to preach God’s Word and see people saved for eternity. However, I also believe they are in error on this issue — wittingly or unwittingly committing eisegesis and thus really undermining ***the authority they are really preaching from***.

Does this phrase simply mean that they are undermining the authority of God's Word, from which they are preaching, or does it imply something else?