Do you have any sources for that claim? I would be genuineley interested in the methodology of this research. Its just anecdotal, but here in Germany it is the other way around. The Catholic south is prosperous, whereas the protestant north (east) is poor. I can think of examples where the opposite is true (Belgium) but I highly doubt that there is a casual connection. In Belgium for example the catholic (and more important industrialized) wallonia was very prosperous during the 19th century, in opposition to the more agrarian flanders. Nowdays its flanders that is more prosperous, and the old industrial regions in the south suffer from the effects of deindustrialisation.

The Protestant northeast suffered from being part of East Germany. A hundred years ago Prussia was much more powerful than Bavaria.

This may be true, but Bremen, Niedersachsen and Schleswig Holstein are not in a very good shape either (at least compared to Bavaria and Baden-Württemberg). But what all of this shows, is that there are a whole bunch of historical and socio-economic factors at play that have no connection with religion.

Prussia was also the last paganic part of Europe.

I have seen several pieces of research on this topic over the years, but here is something from a quick search.

https://www.theguardian.com/education/2011/oct/31/economics-...

I have seen US and England held up as other examples, Germany may be a counter example.

That is not really true. It ignores that in many of the states where this is true, there were very many other cultural differences, and also differences in the laws that they were working under.

I don't think this line of research hold up very well, specially not cross country over long timeframes.

I think you're confusing economic differences between the US South (very not-catholic) vs Northeast (very catholic) as being caused by the religion when there are a bunch of much more important differences, economically speaking, you could look at.

Take a look at total GDP per capita, the northeast is way ahead. Different metric, different results, still not caused by religion.

Correlation vs causation. Does protestantism improve productivity, or did the cultures where productivity is valued highly more easily convert to protestantism?

How do you explain Bayern in Germany then?

Simple explanation: communist occupation of East Germany by the Soviets brought there the "excellent" development opportunities also seen in the rest of Eastern Europe and Russia. Before that, Prussia was way ahead of Bavaria.

That still doesn't explain why Bavaria is ahead of other former West German states.

And global worming does not explain any specific daily temperature. The point is there are hundreds of years of history to do comparative analysis and thousands of locations to consider. I would suggest reading the literature instead of trying to point to a counter example.

PS: Bavaria is only nominally 51 Cathlic vs the average of 30 for the entire country. Further, you can break things down to a much lower level. https://cruxnow.com/global-church/2016/07/18/germany-mass-go...

Ok, then: Ireland, Baden-Wurtemberg, Austria, Lombardy.

Max Weber was a smart guy, but he died 100 years ago. I hope we have better things to correlate with prosperity than just one strain of a particular religion.

Over the last several hundred years Ireland has had massive economic issues. This may have little to do with religion but I don't think it supports whatever point your trying to make.

Have you ever heard of Bavaria? Also called Germany's Texas.