Church membership is increasingly unpopular in some circles. Churches fear it puts another barrier in the way of people's participation. Individuals feel that it is an institutional bureaucracy that you cannot find in the Bible.
However, take time to consider if it might actually be very biblical.
An Elevator Pitch For Church Membership - Jonathan Leeman (Crosswalk.com)
Is Church Membership Biblical? - Peter Cheyne
5 Metaphors For Your Church Membership - David Schrock (The Gospel Coalition)
Why is Church Membership Important? - Josh Weidmann
The Meaning Of Membership - Chet Gladkowski (Church Leaders)
3 9Marks articles by Mike McKinley
Is Church Membership Biblical? - The Remnant Radio
Weigh up for yourself which view is more biblical.
As an exercise, note the arguments made in this video and consider their merits and how you might counter them. It shouldn't be difficult.
The Main Reason People Don't Become Church Members - Dan Reiland