Not really. Hitler was Austrian and the rest of the gang was from Southern Germany, mainly Bavaria – that’s the Catholic part.
That said, support for NSDAP in elections was lower in Catholic lands – not by much, but the trend was statistically significant.
Meanwhile in Spain, Slovakia and Croatia…
From the following website:
www.ushmm.org/wlc/en/article.php?ModuleId=10005206
PROTESTANT CHURCHES IN NAZI GERMANY
The largest Protestant church in Germany in the 1930s was the German Evangelical Church, comprised of 28 regional churches or Landeskirchen that included the three major theological traditions that had emerged from the Reformation: Lutheran, Reformed, and United. Most of Germany’s 40 million Protestants were members of this church, although there were smaller so-called “free” Protestant churches, such as Methodist and Baptist churches.
Historically the German Evangelical Church viewed itself as one of the pillars of German culture and society, with a theologically grounded tradition of loyalty to the state. During the 1920s, a movement emerged within the German Evangelical Church called the Deutsche Christen, or “German Christians.” The “German Christians” embraced many of the nationalistic and racial aspects of Nazi ideology. Once the Nazis came to power, this group sought the creation of a national “Reich Church” and supported a “nazified” version of Christianity.
The Bekennende Kirche—the “Confessing Church”—emerged in opposition to the “German Christians.” Its founding document, the Barmen Confession of Faith, declared that the church’s allegiance was to God and scripture, not a worldly Führer. Both the Confessing Church and the “German Christians” remained part of the German Evangelical Church, and the result was a Kirchenkampf, or “church struggle” within German Protestantism—an ongoing debate and struggle for control between those who sought a “nazified” church, those who opposed it, and the so-called “neutral” church leaders whose priority was the avoidance both of church schism and any kind of conflict with the Nazi state.
The most famous members of the Confessing Church were the theologian Dietrich Bonhoeffer, executed for his role in the conspiracy to overthrow the regime, and Pastor Martin Niemöller, who spent seven years in concentration camps for his criticisms of Hitler. Yet these clergymen were not typical of the Confessing Church; despite their examples, the Protestant Kirchenkampf was mostly an internal church matter, not a fight against National Socialism. Even in the Confessing Church, most church leaders were primarily concerned with blocking state and ideological interference in church affairs. Yet there were certainly members of the clergy and laity who opposed and resisted the regime, including some who aided and hid Jews.
THE ROMAN CATHOLIC CHURCH IN NAZI GERMANY
The Catholic Church was not as sharply divided by different ideological factions as the Protestant church, and it never underwent an internal Kirchenkampf between these different factions. Catholic leaders were initially more suspicious of National Socialism than their Protestant counterparts. Nationalism was not as deeply embedded in the German Catholic Church, and the rabid anti-Catholicism of figures such as Alfred Rosenberg, a leading Nazi ideologue during the Nazi rise to power, raised early concerns among Catholic leaders in Germany and at the Vatican. In addition, the Catholic Centre Party had been a key coalition governmental partner in the Weimar Republic during the 1920s and was aligned with both the Social Democrats and leftist German Democratic Party, pitting it politically against right-wing parties like the Nazis.
Before 1933, in fact, some bishops prohibited Catholics in their dioceses from joining the Nazi Party. This ban was dropped after Hitler’s March 23, 1933, speech to the Reichstag in which he described Christianity as the “foundation” for German values. The Centre Party was dissolved as part of the signing of a 1933 Concordat between the Vatican and Nazi governmental representatives, and several of its leaders were murdered in the Röhm Purge in July 1934]