I'm a former Christian, now atheist, of the agnostic variety, and I find the girl in the painting extremely beautiful. No makeup, natural looks, a little chubby, the epitome of femininity. Those painters of old knew exactly how to capture true feminine beauty. Contrast that image with the current flood of Instagram photos of silicone females with abnormally thick lips, super-sized breasts and exaggerated curves... I won't say "ugly", but I won't say "beautiful" either.
What kind of Christian were you? Catholic, protestant or ortodox?. You can read Chesterton once an atheist and ended up being a Catholic is quite a good lecture and is really rich to learn the religion from other views and not from the normal one. (i dont like fanatics in religion anyways)
Does it matter?
My background would include Roman Catholic via born into it.
A lutheran grandmother
and getting baptized at 24 into Mormonism.
EDIT: NOW
I acknowledge I am pretty small compared to what I have seen and In my current state of existence My ability to understand the place is very limited.
maybe one day I will understand enough of existence to make a proper choice of whats correct.
To think I could correctly believe in the truth (in my current state of existence) is simply far too egocentric.