Not to say about 1:1 ratio of making a miracle. Motuous, can you pray to win a lottery and actually win? Not a chance. Can you pray and not die after jumping from a sky-scraper? Not a chance. Can you pray and stop Earth rotation? Not a chance. Can you pray, say, 65 784 985 times ans walk over water? Nope again. Can you turn water into wine with divine help of prayer? Nope. And on and on and on - you can not make a single minor change at your (or divine) will to any natural law or event.

On the other hand, praying about light curable desease makes brain cure it more - and this may make a difference between a cure and worsening conditions. Yet any serious illness would rather take a well-educated in science doctor or schience - made chemical to cure, not a prayer.

So, stop claiming 1:1 chance of making miracles - this is simply overnaive if not stupid claim.