The vast majority of kidney donors are religious.

Can't we learn something from this about the connection between a religious lifestyle and pro-social behavior?

I don't think so. There are religious groups that donate less, like Haredim. The joke is that at the Kidney Donation Association conference, the speakers/managers are Haredim, the waiters are Arabs, and the audience (donors) are Mizrahi.

Furthermore, other moral activities are actually carried out by secularists (Green Peace, assistance to victims of disasters around the world, etc.).

https://www.knowingfaith.co.il/%D7%99%D7%94%D7%93%D7%95%D7%AA-%D7%95%D7%97%D7%99%D7%99%D7%99%D7%9D-%D7%9E%D7%95%D7%93%D7%A8%D7%A0%D7%99%D7%99%D7%9D/%D7%9E%D7%90%D7%95%D7%A9%D7%A8% D7%99%D7%9D-%D7%99%D7%95%D7%AA%D7%A8-%D7%91%D7%A8%D7%99%D7%90%D7%99%D7%9D-%D7%99%D7%95%D7%AA%D7%A8-%D7%9E%D7%95%D7%A1%D7%A8%D7%99%D7%99%D7%9D-%D7%99%D7%95%D7%AA%D7%A8

Article from the Olamot Institute website. Also appears in the book "Truth and Duty" by Rabbi Moshe Rat. The article unequivocally claims that religious people do more moral actions. The question is, as the questioner asked, whether this means anything. Moreover, it is not about the Jewish religion but about religious life in general, so that a claim for a correlation between the two does not speak about the Jewish religion but about moral actions and religious life in general.

There are many studies on the connection between religious life and various positive things.

Here are two examples that illustrate the value of “research” Such:
[4.5, 9:30] Michael Avraham: https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.haaretz.co.il/science/2025-05-02/ty-article-magazine/.premium/00000196-8cea-dc27-a3df-fefa895c0000&ved=2ahUKEwj08MDbl4mNAxVIVKQEHa5lFv8QFnoECCAQAQ&sqi=2&usg=AOvVaw1S11z9qDrJ1UfQB096Do-1
[4.5, 9:31] Michael Avraham: https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://israelithought.co.il/index_israel/%25D7%259E%25D7%2593%25D7%2593-%25D7%2594%25D7%25A9%25D7%2592%25D7%25A9%25D7%2595 %25D7%2592-%25D7%25A9%25D7%259C-%25D7%259C%25D7%2592%25D7%2598%25D7%2595%25D7%259D-legatum-prosperity-ind ex/&ved=2ahUKEwj08MDbl4mNAxVIVKQEHa5lFv8QFnoECE8QAQ&sqi=2&usg=AOvVaw1mRD3zOyZ4-weyyfCHfOjb

I can't open the first source because I'm not a subscriber to Haaretz. In any case, we're talking about the relationship between religious people and morality, not about Israel's prosperity. I didn't understand why the sources are relevant.

They hang it there religiously. Beyond that, the very contradiction shows how flexible these polls are.