fi·de·ism 
(fēdā-ĭz-əm, fīdē-)
(fēdā-ĭz-əm, fīdē-)n.
Reliance on faith alone rather than scientific reasoning or philosophy in questions of religion.
[Probably from French fidéïsme, from Latin fidēs, faith; see bheidh- in the Appendix of Indo-European roots.]
fide·ist n.
fi′de·istic adj.