Computational analysis by the Pew Research Center of nearly 50,000 sermons that 6,431 USA churches livestream or share on their websites each week reveals differences in content and length across major Christian traditions.
American preachers, in all major Christian traditions, are more likely to refer to books from the New Testament (90% of all online sermons do so) than the Old Testament (61%).
[Visit the Bible Gateway Pastor Resources Page]
This pattern is especially pronounced in mainline Protestant and Catholic sermons: These two groups are, respectively, 39 percentage points and 40 percentage points more likely to mention a book of the New Testament than to mention a book of the Old Testament by name in any given sermon. This may reflect the fact that most ministers in the mainline Protestant and Catholic traditions preach on the day’s Gospel reading, which is always from the New Testament.
[Read the Bible Gateway Blog post, New Minister’s Bible Includes Clergy Resources for Life Events]
References to books of the Bible vary over time. For instance, the share of all sermons that mention a book of the Old Testament by name declined by 13 percentage points on the week of Easter Sunday (to 49% from 62% the previous week) and then rebounded the following week.