"Orthodoxy also has a real problem with nominal members" - This is true, my wife and I discuss this often. Converts tend to be quite zealous which amplifies the problem too 😌.
Forgive me, I was not so sure I should post this but Jay came out of and was educated in the reformed tradition (was a Roman Catholic too). Hopefully this post is at least an interesting read.
https://jaysanalysis.com/2010/04/08/more-problems-in-western-and-calvinistic-theology/