Most Christians have never actually studied the Bible creation story to see for themselves that Genesis 1 was first to describe the Big Bang (instant creation from nothing), more than 3,000 years before scientists discovered it in the 20th century!
The Big Bang is now settled science.
God reveals Himself to us in two ways: His word and His world. Both are true and, properly understood, cannot be in conflict.
How would you explain to someone that God's revealed word is not in conflict with His revealed world with regard to earth's origin?