I'm a scientist; I look at evidence objectively.
When a person has stomach cancer and is having surgery in 3 days, I pray for that person to be healed by the power of Jesus, and the next day at the doctor x-rays show that the cancer just dissapeared, what other conclusion can I come to other than the fact that God may have had something to do with it. Cancer just doesn't dissapear by itself. Cancer by definition is out of control cell growth. If left untreated cancer cells just don't stop, they keep multiplying such that thay will eventually kill you. So my question is, if I pray to my God for something impossible to happen and it does happen, then what other conclusion is their that my diety is not only real, but took care of whatever issue it was I had?
If one does not keep an open mind to the possibility that a God may exist, one will reject any indication that it may be true. I've seen too much proof to not believe God is real.
As a scientist you should know something about
causality. Just because you do something, and something else happens at the same time, does not mean there is any kind of
relationship between the two incidents. Falsely assuming causality is one of the biggest fails a scientist can do, and in your example you are doing just that.
If you want to test your theory, you should pray for 1000 different people with cancer to see if you can recreate the miracle. It is very likely that it won't happen again. If you use the logic of God existing because he answered your one prayer, you should use that same logic and think that God probably doesn't exist because those 1000 prayers did nothing. Logically speaking, if one prayer worked and 1000 failed, it's much more likely that the first prayer working was just two separate things happening at the same time without any kind of causality. The problem is that for a person who experiences something like that, the effect is so emotionally powerful that he or she loses all rational thought and will believe pretty much anything.
If you look at statistics, religious people suffer just as much disease and bad luck as everyone else. If prayer works, why doesn't it show up in the statistics? Are the statistics lying? I don't think so. It's much more likely that prayers do not actually do anything unless you happen to pray for the right thing at the right time, aka being extremely lucky. If I pray for rain and 1 minute later it start raining, was it God answering to my prayer. Maybe. But the more likely explanation is that it would have started to rain even without the prayer.
I see people use the words "open-minded" a lot. I think we should make a distinction between having an open mind and blindly believing in something. Do you believe in Easter Bunny? If you say no, does that make you close-minded? Nope, it makes you rational. Just because religions are more popular and socially acceptable than belief in Easter Bunny, does not mean believing in religion makes you "open minded" and believing in Easter Bunny makes you crazy.