Depending on who it was that said it, I'd probably respond with
"You don't know what you could do until you trust in God and your own abilities" or something along those lines...
Normally when you inject God and/or religion into a statement, those negative, nasty folks seem to just run in the opposite direction!!!
Try it...when I am at work and someone I know is being messy asks me how I am doing, I respond "I am blessed and highly favored"...they leave quick, fast and in a hurry!!!!!!