I have a friend who does what your mother does - makes everything that happens about religion when he knows I'm not religious. It's super annoying.
I think all you can do is say to your mother that while you know she means well and is trying to help, in fact you are not religious and that much as you appreciate it, she's not being helpful to you.
Is there anyone else you can talk to about your illness and problems? A good friend or another family member? Do you have a good doctor?
If your mum is going to continue with this I would be trying to get support from someone else who won't push their belief system on you, especially when you're already upset and anxious.
It must be frustrating for you.
People here will be happy to support you if you'd like to talk more here.
I hope things pick up for you!