Which religious holidays if any, should governments take into account when deciding election dates? See detail.

Even within Christianity there are differences. Greek Orthodox versus the rest for example: https://www.newsweek.com/greek-easter-eastern-orthodox-christians-celebrate-different-date-1405551
If you take all the religious holidays of all the non-obscure religions, and denominations, how many days are there to not book the election dates on? Edited to add.