have an idea for a prayer app. Please tell me why it will fail.

I’m working on an idea and I’d like honest feedback before I spend months building it.
The idea is simple:
The app detects your location.
It shows nearby mosques.
You can select a mosque and follow its official prayer timetable.
Your phone’s prayer alarms automatically sync with that mosque’s timings.
If you travel to another city or country, you can switch to another mosque with one tap, and your alarms update automatically.
Mosques would have an admin dashboard to update their own prayer and Iqamah times.
The goal isn’t to replace existing prayer apps. The goal is to make it easier for travelers to always follow the official timetable of the mosque they’re attending.
I’m looking for honest criticism, not encouragement.
Please tell me:
Would you actually use this?
What’s the biggest flaw in the idea?
What problem am I overlooking?
Does another app already solve this better?
If you were building this, what would you do differently?
I’m especially interested in feedback from frequent travelers, mosque administrators, developers, and anyone who regularly uses prayer apps.
Don’t hold back—I want to know why this idea might fail before I invest time and money into it.