The author of this piece, Ryan Burge, typically relies data that is scoped to the US for his pieces (to the best of my knowledge). You would have to reach out to him to inquire about the UK, if any similar data is available for analysis, etc. With that said, the ARDA appears to have global data available at https://thearda.com/

> This post has been unlocked through a generous grant from the Lilly Endowment for the Association of Religion Data Archives (ARDA). The graphs you see here use data that is publicly available for download and analysis through link(s) provided in the text below.

Code for this post can be found at https://gist.github.com/ryanburge/0895d855fdc93c3ce26b034349...

(Ryan also wrote "The Vanishing Church: How the Hollowing Out of Moderate Congregations Is Hurting Democracy, Faith, and Us," which I highly recommend; he is exceptionally data driven within this domain, no affiliation besides subscribing to his Substack)

https://bakerpublishinggroup.com/products/9781587436697_the-...