What is a testable claim

I’m watching the Jamy Ian Swiss video from last Saturday (Orange County freethinkers; you know the drill), trying to figure out what all the fuss is about – his fuss among other fusses.

One claim of his that I don’t understand, though it’s possible that I will once I’ve watched the whole thing. At 23:42:

If you believe in god based on faith, that in and of itself is not a testable claim. We have no debate with that.”

Yes it is. If you “believe in god” then “god” must have some meaning. Once you know what the meaning is in the particular case, then it becomes a testable claim. Even if you say “god” means something large and abstract like Love, it’s still testable. Maybe it’s possible to make “god” so very large and abstract that it no longer is testable, but then…it’s not really “god” that you believe in, you’re simply using that word to name something else, because the word gets respect and deference.

Tell me why that’s wrong.