It’s certainly notable that as religion has been abandoned by newer generations, the concept of tithing (10-15% to your church) has fallen out of public consciousness.

I do Effective Altruism, donating at least 10-15% of my income, but was only peripherally aware of people donating to church, and only thought it was pocket chance not thousands a year.

Donating to Effective Altruism charities is quite different ethically to tithing, though.