Many people do not believe in any miracles.
Check this article.
http://en.wikipedia.org/wiki/Our_Lady_of_Lourdes#Secular_views
why do people not believe in the miracles of lourdes
2 answers
For those who do not believe, no proof is possible. For those who do believe, no proof is necessary. The medical bureau however, has recorded some rather astounding sudden changes in sick people which can not be explained as delusions or faith healing fakery.