To state that Prayer is demonstrably effective as Amos has done without disclaimer you must either have selective forgetting or read a heavily preselected set of articles and books. Those who want to be fully informed should also read the more recent article

Aviles JM, Whelan SE, Hernke DA, Williams BA, Kenny KE, O'Fallon WM, Kopecky SL. Intercessory prayer and cardiovascular disease progression in a coronary care unit population: a randomized controlled trial. Mayo Clin Proc 2001 Dec;76(12):1192-8

and some of the references there.

Same as others have said, the sentence 'I'll pray for you' doesn't scare me, it annoys me. I'd wish those people would keep it to themselves.

There are a couple of fields in my life where I have beliefs (politics, personal values,...), but this ain't one of them. I don't fall in the belief/disbelief in No God dichotomy. For me, the supernatural is an unnessessary hypothesis that's all. The question of belief or not doesn't come up.

Those believers in God as wvpreacher who speak about their beliefs as if they were facts I find both amusing and annoying.

Wolfgang