You might find that there is an interesting guide to what was going on in the religious communities by studying voting patterns. This may be a guide to the attitudes of Churches ‘on the ground’.
Like the Socialist+Communist vote (the two have to be taken together because there was a lot of switching from one to the other in different elections, the Socialists were by far the bigger Party though) which remained pretty constant, the Catholic vote (there were two Catholic parties, the Zentrum - which represented all areas other than Bavaria and the BVP - the Bavarian Peoples’ Party) stood up very well to the electoral growth of the NSDAP - whose rise saw the collapse in the vote of all other ‘conservative’ Parties. Studies like Ian Kershaw’s ‘Popular Opinion & Political Dissent in the Third Reich’ would suggest that after Hitler’s arrival in power, again rather like the Socialists+Communists, Catholics (especially in Bavaria) lived in a kind of sullen resignation most of the time.
The NSDAP was fundamentally a middle-class Party (predominantly lower middle class - office and shop workers, artisans and proprietors of small farms) but, statistically-speaking, the most likely to vote NSDAP were Protestant farmers living in the German States bordering on other countries (especially to the East).
The situation in Austria was somewhat different - in Austria, the overwhelmingly Catholic population welcomed the arrival of German troops. Of course, political anti-Semitism in Hitler’s country of birth was much more developed than it had been in Germany itself - an example being Karl Lüger, Mayor of Vienna, who had certainly been an influence on young Adolf himself.