There was all sorts of clerical support for the Third Reich, but one of the main problems with uncovering this is the blatant rewriting of Church history by the Novus Ordo, which seemingly many traditionalists are willing to go along with when it comes to this controversy.
Report from November 24, 1933, on the words of Bishop Berning to the Catholics in Hamburg, Germany, after the national referendum of November 12, 1933:
"In the new German state, German Catholics joyfully support the Führer, whom the German people unanimously affirmed when called upon last Sunday to defend unity and unanimity in Germany. For German Catholics, true allegiance to the Führer and responsibility for the well-being of the state is a patriotic and religious duty. Catholics bring valuable cultural assets to the building of the Volksgemeinschaft [Volk community]: a strong optimism and belief in progress, a lively sense of community, a warm love for German-ness, for blood and soil, for our language and traditions, for the formation and destiny of the German Volk."
Source: Klemens-August Recker. "Wem Wollt Ihr Glauben?": Bischof Berning im Dritten Reich ["Whom Do You Want to Believe?": Bishop Berning in the Third Reich] (1998), p.69, citing from Nachrichtenblatt für die Kath. Gemeinden von Hamburg, Altona und Umgebung [Newsletter for the Catholic Communities of Hamburg, Altona, and Surroundings], November 24, 1933.
And another statement from a different bishop:
"I consider it an evident duty of every German, for the sake of the solidarity and unity of the German people, to answer with a cheerful 'Yes' to the Führer's question."
- Bishop Birchall, Frederick T. (19 August 1934). "nαzιs See Betrayal in Hostile Ballots in Today's Vote". New York Times. p. 1.