Christian democracy is the political culture that has been the driving force behind European integration. Yet, according to Martino Comelli, it has also facilitated the democratic backsliding of some countries of central and east Europe by providing an illiberal political toolbox of narratives and policies
The article also argues for the same point, I believe. However, it posits that the right-wing and populist movements in Europe are employing the language and political tools of Christian Democracy to rationalize their actions. The process of European integration has also contributed to these dynamics. Nonetheless, you are correct; the fundamental reasons lie elsewhere.