We live in a surprising world if we only look around. There are two things about history and the saints that I firmly maintain against the dreary naysayers who wish to wipe all color from history.
First, people can be extraordinary. Dismissing a story because it is unlikely an average person could do so much is irrational. By definition, not everyone leads an average life. Take, for example, a Swedish girl with no particular scientific expertise who at the age of 15 becomes an international celebrity protestor against climate change and travels the world meeting heads of state. It is an extraordinarily unlikely story, but Greta Thunberg is quite real. And so are saints who broke the mould and beat the odds.
Second, if an all-powerful and loving God exists, then miracles are logical. He should be using that power in the world, and there is no reason He needs to be bound by laws that He created. Indeed, if you ask most physicists, the particular physical laws governing our universe generally are not necessary; other universes could (and may) easily have different laws. God, in traditional doctrine, is beyond our universe and our scientific methods for studying this physical universe. Healing and other events with no current scientific explanation have been well documented, in part during the process of canonizing saints. The lack of a scientific explanation now does not necessarily mean there may not be one in the future, but it does open the rational possibility that what believers describe as miracles are in fact dramatic interventions by God in our world.