Tell me about it.
To address Phoenix, what exactly do you mean by 'primitives'?
Sorry about that....my personal opinion is that like everything in life, if you BELIEVE you are either under the influence of a blessing or a curse, it can help or harm you. As for the ones who do not know who may be praying for them (great question), the jury is still out for me. If the suffering person has a strong desire to survive, they just might, despite any 'unknown' prayer. I think overcoming all adversity comes from within, and all 'curses' from a naive lack of self-esteem.
In the end, if the people praying for the unknown recepient feel they are doing good work, that empowers them, and that is a positive thing. As for those who curse others, I'll give them the number of a good shrink. Their own motivations will consume them eventually.