Almost all science and logic in the history of the world is based on correlation. Discovering the causal link comes later, or more often than not never.
Your glib comment seems smart to people on the internet, but what it actually demonstrates is a complete lack of understand of both words.
If you don’t think there is a concerning religiosity on the left, you’re part of the problem. The right is a significantly more serious problem in the near term, but the growing treatment of political thought as doctrinal and highly internalized belief among leftists and (to a lesser extent) progressives has all the makings of something can cause serious issues to the march of progress.