I've met one
Grace and too many that have it as a middle name. It used to be on my list as a middle for the combination
Georgina Grace but I've decided that's its too boring and popular.
Recently I've become a huge fan of short one-syllable names, especially for girls,
Grace ranks but isn't one of my favourites.
If I named my child
Grace I would always be worried that they'd be really clumsy - like I was as a child - and be called Graceful in a teasing sort of way. Of course this is stupid because most children get teased no matter what, but it remains a potent concern.
I quite like
Gracie, especially when the child's really little, I met a full-name
Gracie but I think it's too cute to work on an adult.
I don't think it's religious sounding, no more than
Hope anyway.