For the poll to be coherent they have to take into account the shifting demographics of the overall Christian population since 2018, if you have a group of 100 Christians with 30% being zealots in 2018 and by 2024 ten became ex Christian and 30 zealots became 40 zealots

Then you can torture the poll to give you the above results by simply not taking into account the fact the overall population has shrunk while churchgoing among the remaining population has gone up in percentage, despite the fact it’s gone down in absolute numbers