Reference: http://www.alfawzan.af.org.sa/node/16893
Question: Regarding the recitation of [soorah] al-Faatihah a hundred times; we read it, since it is to be read a hundred times due to a necessity which we need accomplished, and for the return of that which has been lost, and other than that?
Response: This is falsehood, and it is [an act to be] detested, and it is not permissible. That is because no evidence exists from the Book of Allaah, and nor from the Sunnah of His Messenger ﷺ [to support this]. Rather, [soorah] al-Faatihah is to be recited during the prayer, [as the Prophet ﷺ said]:
«There is no prayer for the one who did not recite the beginning chapter of The Book»
And it is also to be recited as spiritual healing for himself or upon the one who is sick.
