It’s easy to imagine that Francis doesn’t like Orban. Francis believes Europe should throw open its doors to Third World immigrants; Orban believes that would be the death of Europe. The Catholic journalist John L. Allen Jr. has written that the plight of migrants is the cornerstone of Francis’s papacy. Francis has refused to meet with leading Italian politician Matteo Salvini in protest of Salvini’s anti-immigration views and policies.
This is clearly why Francis refuses to meet with Orban.

If I were Orban (a Calvinist, though his wife and kids are Catholic), I would wear that as a badge of honor. You can make a case that his policies have done more to protect Europe’s Christianity than the pontiff’s. Hear me out.