Yes.  Fillon figured out there was a subset of Catholics within France and exploited it in the conservative party's (LR) primary.  Unfortunate for him, many Catholics (or people in general) don't approve of public corruption.  It would be interesting if France developed a moderate sort of Catholicism however.  When I was there, it was mostly right wing extremes.  The SSPX has a presence in France and those types tend to support FN.