Barna survey looks at changes in worldview among Christians

The Barna survey defines a "biblical worldview" as:

believing that absolute moral truth exists; the Bible is totally accurate in all of the principles it teaches; Satan is considered to be a real being or force, not merely symbolic; a person cannot earn their way into Heaven by trying to be good or do good works; Jesus Christ lived a sinless life on earth; and God is the all-knowing, all-powerful creator of the world who still rules the universe today. In the research, anyone who held all of those beliefs was said to have a biblical worldview.

They found that 9% of all American adults have "biblical worldview".
They comment:

Ongoing research by The Barna Group on these matters consistently demonstrates the powerful impact a person’s worldview has on their life. A worldview serves as a person’s decision-making filter, enabling them to make sense of the complex and huge amount of information, experiences, relationships and opportunities they face in life. By helping to clarify what a person believes to be important, true and desirable, a worldview has a dramatic influence on a person’s choices in any given situation.

And find that:

* One-third of all adults (34%) believe that moral truth is absolute and unaffected by the circumstances. Slightly less than half of the born again adults (46%) believe in absolute moral truth.

* Half of all adults firmly believe that the Bible is accurate in all the principles it teaches. That proportion includes the four-fifths of born again adults (79%) who concur.

* Just one-quarter of adults (27%) are convinced that Satan is a real force. Even a minority of born again adults (40%) adopt that perspective.

* Similarly, only one-quarter of adults (28%) believe that it is impossible for someone to earn their way into Heaven through good behavior. Not quite half of all born again Christians (47%) strongly reject the notion of earning salvation through their deeds.

* A minority of American adults (40%) are persuaded that Jesus Christ lived a sinless life while He was on earth. Slightly less than two-thirds of the born again segment (62%) strongly believes that He was sinless.

* Seven out of ten adults (70%) say that God is the all-powerful, all-knowing creator of the universe who still rules it today. That includes the 93% of born again adults who hold that conviction.