I think it just depends. Some things are more accepted, others less.
It might be pretty career-limiting if one admitted that the reason one never works Sunday mornings is because one is at church.
Also who works on Sunday morning?
>One reason I moved into a big city is to be able to do grocery shopping on a Sunday morning.
Nearly every grocery store in every small town in the country is open on Sunday morning. Is it different where you're from?
Yes in France in most smaller towns Sunday most everything will be closed. There are special rules about working on Sunday in the law.
I think it just depends. Some things are more accepted, others less.
It might be pretty career-limiting if one admitted that the reason one never works Sunday mornings is because one is at church.