If you assume that every single CRA loan defaulted, and that every failed loan in the entire housing market was a CRA loan (both assertions are far from true), then the CRA would be responsible for a multiple billion dollar problem. Maybe. Might be well under 1b when you consider that the homes are re-sellable after foreclosure unless they burned without insurance.
On Wall St, we wound up with a multiple trillion dollar problem. That's tr-, not b-, as in 1,000X bigger.
The CRA thing is ideological bullshit. I seriously do not understand how anyone who passed 3rd grade arithmetic could buy into it.