Like the 3 who went into the furnace, before they went they said - maybe God will save us, maybe not. In this case, He did. He did not intercede when Christians were burned to light Nero's dinner. No one says that the 3 had more faith and that's why some are saved and others not in the physical realm. Some believers get sick, some die, some are healed - some believers speak in tongues, some don't. It's ALL God's work - not yours or mine. And I'm fairly certain He doesn't work on demand. That's why snake handling/poison drinking churches are condemned for putting God to test. One poster, long gone, said fellow inmates tried to poison him with bleach but he survived thanks to God. I believe that happened. I believe God can do anything and everything, absolutely. He does it - not some human being "instilled" with His Authority. And His purposes are not all revealed to us on this earthly plain. If I lay my hands on you and you are healed, I'm a liar if I claim this work as my own.
Dan 3:16
Shadrach, Meshach, and Abednego, answered and said to the king, O Nebuchadnezzar, we are not careful to answer thee in this matter.
Dan 3:17
If it be so, our God whom we serve is able to deliver us from the burning fiery furnace, and he will deliver us out of thine hand, O king.
Dan 3:18
But if not, be it known unto thee, O king, that we will not serve thy gods, nor worship the golden image which thou hast set up.