Barna conducts tens of thousands of interviews every year, attempting to make sense of public opinion, cultural trends and religious identity. This year, our most-discussed research and reports were those that strengthened our profile of young adults—not just in the United States but in 25 countries around the globe—and had a particular focus on understanding the forces shaping the future of evangelism and discipleship. To wrap up 2019, we’ve compiled our 10 most popular releases of the year:

1. Almost Half of Practicing Christian Millennials Say Evangelism Is WrongAlmost all practicing Christians believe that part of their faith means being a witness about Jesus (ranging from 95% to 97% among all generational groups), and that the best thing that could ever happen to someone is for them to know Jesus (94% to 97%). Millennials in particular feel equipped to share their faith with others. For instance, almost three-quarters say they know how to respond when someone raises questions about faith (73%), and that they are gifted at sharing their faith with other people (73%). This is higher than any other generational group: Gen X (66%), Boomers (59%) and Elders (56%).

Despite this, many Millennials are unsure about the actual practice of evangelism. Almost half of Millennials (47%) agree at least somewhat that it is wrong to share one’s personal beliefs with someone of a different faith in hopes that they will one day share the same faith. Throughout 2019, readers and leaders continued to engage with this staggering statistic from our Reviving Evangelism report, produced in partnership with Alpha USA.

2. The Most Post-Christian Cities in America To qualify as “post-Christian,” individuals must meet nine or more of our 16 criteria (listed below), which identify a lack of Christian identity, belief and practice. These factors include whether individuals identify as atheist, have never made a commitment to Jesus, have not attended church in the last year or have not read the Bible in the last week. These kinds of questions—compared to ticking the “Christian” box in a census—get beyond how people loosely identify themselves (affiliation) and to the core of what people actually believe and how they behave as a result of their belief (practice). These indicators give a much more accurate picture of belief and unbelief in America.