But it doesn't really, not even if your experiences are taken as fact. For example. Let's say that every single time you pray for rain, it rains. Even though such a thing isn't likely, let's for the sake of argument say it is true. Even so, it is not proof of anything in particular. There are more or less endless reasons why such an event might occur, everything from deities, aliens, hallucinations, living in a simulation or simple implausible, but possible, coincidence. So even if personal experience is taken as fact, it is not proof beyond the occurrence taking place, and says nothing of the mechanism. The mechanism is merely assumed from there by the party experiencing the event, but it is not proof of the person's belief system.

Even if there was absolute proof of god to you, it would not be proof of Christianity, merely that proof of a deity type entity was presented to you. Any beliefs as to the mechanism of the deity, the will or capability of the deity would be nothing more than assumptions. Hell, you cannot even rule out insanity or that another more powerful, but mundane alien species is having fun at your expense.

Even if one assumes the existence of legitimate miracles, the possible explanations for them could be nearly unlimited if you take confirmation bias out of the equation.