The Full Form of BIG is Believe In God.

Pew’s domestic survey—“When Americans Say They Believe in God, What Do They Mean?”—found that although 9 in 10 Americans say they believe in a higher power, only a slim majority believe in the God of the Bible.

Pew’s massive Religious Landscape Surveys published in 2007 and 2014 had already shown that the share of Americans who believe in God with absolute certainty has trended downward in recent years to about 63 percent, while those voicing doubts about God’s existence has grown.

“These trends raise a series of questions,” notes the new survey report. “When respondents say they don’t believe in God, what are they rejecting?” Just as important: What do respondents mean when they say they do believe in God?

The survey of 4,729 adults, conducted online in December 2017 via Pew’s American Trends Panel, began by asking respondents, “Do you believe in God, or not?” Although 80 percent of respondents answered “yes,” subsequent questions revealed that just 56 percent believe in the divine being described in the Bible. Roughly a quarter (23 percent) of all the “yes” respondents said they believed instead in a “higher power or spiritual force.”