I think if you want others to do something they might not agree on, such as religon, then perhaps people should ask to keep them mind or just take a moment of silence, but again, I don't think making a thread about a person that only you know is something everyone on GC wants to know about or this thread wouldn't have been made.
I'm not trying to offend the person who is asking for prayer, I'm just trying to let you know that not all people will accept your invite to pray for the person you have in mind and that the word Prayer isn't in everyone's vocabulary or beliefs so you need to be prepared to handle questions and comments like the one addressed in this thread.