Not that I agree with him, but "faith" in Galatians 5:22 in the greek is indeed a noun, the same as in Ephesians 2:8.
However, in Ephesians 2:8, it's a genetive noun, while in Galatians 5:22, it's a nominative noun.
What that means, exactly, I'm not sure, but there is indeed a difference...