When they submit their name tags they will be required to submit personal information to the church's records. This includes their full name, address, email, family members, and many other forms of personal information.
Head counts happen every once in a while. The difference is that this time members will be recording their fingerprints onto their personal files. They will also be asked for their social media accounts such as Facebook and Twitter. It would be pretty easy for the church to find dissenters if they have their social media accessible at any time.
Remember: nobody can force you to give away your personal information, and if they do it is probably illegal.