Your story reminds me of my current GF, who is catholic. she had to "justify" dating me to her granny, who said something along "he is probably mkay, but atheist! have you lost your mind?"
After meeting me, granny had to correct her perception and accept that atheists can be actually good people too :)
An ex of mine is catholic and black. The amount of scrutiny I underwent as a white atheist was quite amusing. And quite enlightening in some ways. One of her aunts still keeps trying to invite me to church, several years after we broke up...