My customers keep getting offended by my shirt

Unusual kind of post but still religious cringe:

After I finished helping someone I said "have a good day" and walked away, but then she said "you see no god?" Which was confusing before I realized what she was talking about lol. After a second I said "oh yeah haha, I thought it was cute." And she responds with "well I have a good god."

I just said "okay" and walked away again. But I wish I would've asked her if she seriously thought I worshiped a dog with a cone on its head lol.

This is the third time I've gotten a negative comment on my shirt at work. I'm not even anti-religion, I just thought a dog that had to get a cone juxtaposed with him saying he's a god was funny.