Lukvance, we have had other religious folks come here, and when they can't make us accept their illogical arguments, they do the same thing you have, which is retreat into nonsense: "Well, we can't really know anything for sure anyway, and it is all up to faith, and everyone has their own reality, and my reality says that god is real and that's that."
But if you really truly thought that, you would have to also accept the possibility that our reality is correct: that god is not real. And that Satan could be responsible for the handful of miracle healings at Lourdes, especially since millions of people are overall made worse off by going there. And that love, fear, and even religious feelings are emotions is produced by chemicals in the brain.
You don't accept that Satan heals people at Lourdes, so you do believe that there is an objective reality out there, not just up to each person to decide for themselves. Except when reality disagrees with you.