Why? What good can it possibly do for RD? Do you seriously think there is some God who will pay attention to those prayers and then do something to improve his condition? Should he rely on some imaginary god to help him regain fitness, or is it better to rely on 300 mg soluble aspirin, correct pills for blood pressure, exercises
advised by physiotherapists, support from Stroke experts, etc etc.
And I suppose I might just as well delete all that, but I have decided not to! 
Surely, if we as human beings, be we Atheist or Christian can be concerned about a human being independent of their religious stance. Then who is to say God is not where the knowledge of Aspirin and medication and physiotherapy came from out of concern for none believers?
Does it harm anyone to pray for healing and restoration?
Does it harm anyone to give them medication?
In the scheme of things surely all things that comfort those who are concerned or tending the sick are a measure of healing for them and the concerned. I cannot close my eyes and believe that those who are atheists should not be prayed for.
I personally believe those without faith need the experience of both medicine and concerned prayers of people who care for them. After all both express the willingness to support the person in need. Express away is what I say...