This is worth a look:
Earlier this year, Ligonier Ministries commissioned a survey of 3,000 Americans in partnership with LifeWay Research. The survey quantified Americans’ theological knowledge and awareness. A combination of true and false statements was used to test participants. The survey addressed core doctrinal topics and issues, such as the Bible, salvation, God the Father, Jesus Christ, the Holy Spirit, sin, the Trinity, man, hell, and the nature of the church. In our desire to serve the church in fulfilling the Great Commission, these findings help to point out common gaps in theological knowledge and awareness so that Christians might be more effective in the proclamation, teaching, and defense of the essential truths of the Christian faith.
Click here for what they found.