The term "churchling" can be used to refer to a young person who regularly attends church or is actively involved in church activities. However, there are other words that can be used interchangeably with "churchling" depending on the context in which it is used. "Youth group attendee" or "youth group member" are commonly used in reference to young people involved in church youth groups. "Churchgoer" is a broader term used to describe individuals who regularly attend church services. "Believer" or "faithful" can also be used to refer to individuals who have a strong religious affiliation or commitment. Ultimately, the term used depends on the specific context and intention of the speaker or writer.