Birmingham (now maybe 30 percent Muslim) has by now already 50 percent Muslim newborn. From 2011 to 2021 the percentage of Muslims rose about 10 percentage points. It seems like a plausible candidate.

The closest as of September 2023 is Montpellier at 26.6%.

Resolves as YES: Istanbul is a big European city that has more than 50% Muslim population.

@a2bb obviously I meant western Europe, countries like Germany, Belgium, France, etc...

My bad and thanks

@Mikelon797 It is not obvious at all, and western Europe isn't clear either.

@a2bb I would not ask something by 2050 that is already true 😅

@Mikelon797 you should make this more clear. Turkey is seen by many as part of the 'west" going back to the cold War e.g. its NATO membership...

@DanielPugh thanks for feedback, one updated it. Sorry for any inconveniences