Sadly, no matter what evidence I produce, I fear you would find some reason to dismiss it.
Well because the counter evidence is overwhelming.
I've been to Lourdes. My son has volunteered as a helper there. I've seen the hundreds of sick and disabled being wheelchaired in at the start of their stay, and the same people get helped to leave at the end of their stay, still wheelchairbound.
So the best you can claim is an erratic god using his power, seemingly at random, healing maybe the one but ignoring the one thousand. That is not a god I would worship.