The Most Rev. Justin Welby is the archbishop of Canterbury, head of the Church of England. He has engaged a number of social issues since being installed in this role in March 2013, including poverty, climate change and medically assisted suicide.

Davis Voas is a professor of social science at University College London, where he studies religious change.  He helps lead the European Values Survey and British Religion in Numbers project.

Scott McConnell is the executive director of LifeWay Research, which conducts surveys on issues affecting American religious life and Protestant pastors. Arrange an interview through Aaron Earls.

Mary Gautier is a senior research associate with the Center for Applied Research in the Apostolate, which studies Catholic demographic trends.

The Rev. Randy Wall is senior pastor of New Covenant United Methodist Church in Mount Holly, N.C. He’s also the chairman of United Methodist Rural Advocates, a group that advocates on behalf of rural and small-membership churches within the denomination.

The Rev. Althea Spencer-Miller is an assistant professor of New Testament at Drew University Theological School and a United Methodist pastor.