Thousands of Christians TODAY will swear they have seen miracles occur at their church, blind seeing, cripples walking, handling poisonous snakes to no harm. So eyewitness testimony means absolutely jack shit, a gifted manipulator could use cold reading methods to wow the uninitiated, a charismatic person could use any number of techniques. There's drugs and alcohol that could be used in a ritualistic manner. That David Blaine dude could easily become a cult leader by showing he can levitate etc lol. Then there's Christians who simply think the Bible is to be read as allegories or read in a mythopoetic way where much isn't literally true but conveys a deeper meaning. So you have lots of Christians who believe in evolution, or maybe that evolution was set off by "God." Or don't believe the ark story was literally true, nor the miracles of Jesus.
It's a minefield. Fortunately. very few, I would say 10% of USA Christians have actually read the bible cover to cover. I have yet to meet more than 10 at most. So most have no idea what the bible actually says. They here bits and pieces cherry picked by pastors. So Christians play it safe. They say they believe in Jesus like that's some magic insurance policy just in case it's true. Let me ask you this... If tomorrow, an alien ship appeared above the White House, huge.. ominous, and it beamed down a book you could read in a week... how many Americans would read the book cover to cover in a month? Now we have the bible.. been around over 2,000 years, supposedly words of God, or the very least , inspired by God, yet such a small percentage have bothered to read it not 10 times, but once... Yes, they know the popular scriptures, John 3:16 etc, but never bothered to read it. You just can't convince me they REALLY believe in god or the bible. It's all about what they were brought up to believe, and or social expectations... I've read it, many times, which is part of why I am Agnostic/Atheist.