I don’t know how many people are familiar with the story of the man who thinks he’s dead and cannot be convinced otherwise. Here’s a short version of this:
A man is convinced he is dead. His wife and kids are exasperated. They keep telling him he’s not dead. But he continues to insist he’s dead. They try telling him, “Look, you’re not dead; you’re walking and talking and breathing; how can you be dead?” But he continues to insist he is dead. The family finally takes him to a doctor. The doctor pulls out some medical books to demonstrate to the man that dead men do not bleed. After some time, the man admits that dead men do not bleed. The doctor then takes the man’s hand and a needle and pokes the end of his finger. The man starts bleeding. He looks at his finger and says, “What do you know? Dead men do bleed!”
According to an atheist’s worldview, miracles are impossible. They are as nonsensical as square-circles which is why their asking for “evidence” for miracles is an exercise in futility. For the Atheist who demands or expects evidence for miracle claims, he knows he is playing a rigged game, there is no evidence as far as he is concerned. Not because none exists, but according to their worldview, no evidence is possible. Evidence offered in favor of a miracle claim is dismissed using any possible alternate explanation no matter how unlikely or implausible, since of course, any alternate explanation is more plausible than the possibility of a miracle given a naturalistic worldview.
There could be a dozen lines evidence for argument in favor of a particular miracle, and the skeptic would continue to protest, “that’s not enough”. The point being, there will never be enough evidence to satisfy a quantity sufficient enough to convince him miracles can happen, they are careful to always leave themselves that escape.
No type of evidence will be ever be extraordinary enough for the skeptic either. I can see it now: pictures and video can be altered, witnesses can be mistaken or lying. Even seeing for themselves would not likely elicit the concession of a miraculous event. For example, if the skeptic proposed that if “I am God and I do exist” were to be written in the stars, they would admit miracles happen. But I have my suspicions. Even if it were to happen before their eyes, I believe they would still seek another explanation — any other explanation except a miraculous one.
I’ve asked Atheists in the past what it would take for them to believe God exists. The majority of the respondents said they’d concede theism if God would perform some miracle in front of them. However, I don’t have any confidence that they wouldn’t simply say, “What do you know? The stars arranging themselves to read ‘I am God and I do exist’ is a natural phenomena after all!”