Beacon

In a Christian church, deacons assist the pastor with the duties required to keep the church running.  They might not be paid but their status is recognized by the honorific "Deacon".

"Beacon" might be a recognizable title for the equivalent position in a Religious Humanist or Religious Transhumanist organization.  Since a beacon is a guide in the dark such as a lighthouse, this term fits nicely with the theme of the Brights, those who identify as having a naturalistic worldview free of supernatural or mystical elements.