A big cross on home screen

Can you upload a picture so we know what you are seeing?

 

You haven't gone to church in a while?

 

Have you been sinning?

 

Is it a Google brand phone? They've been deleting accounts of people selling to unauthorized resellers?

 

I've never seen anything like that x on a homescreen before. Is it always there @Arrow7019? Which phone do you use and where is the homescreen picture from?

 

That's looking like a plus sign to add a shortcut to a blank screen.
Swipe left or right.
Part of your launcher is my guess

 

That could even be part of the wallpaper aesthetically (creates an old film camera viewfinder look). I assume it remains if you change wallpaper?

I'd certainly check the launcher settings if it only appears on the home screen. Can you interact with it? If you put an icon there does that cover it (i.e. does it behave like part of the wallpaper or something above it?)?