I had started Tombyards and Butterflies and for some reason, halfway through Chapter 1, it just wasn't clicking, so when I saw No God is Safe, and read the blurb and realized that, is in a way, it's a prequel, I decided to read it instead. I guess it was "the way they met" that did it, for now, I'm back with Tombyards and Butterflies, and everything makes sense.
As for No God is Safe, it's fairly rare that Asian or Eurasian dieties are featured in stories and this little run-in with Shiva and Kali, in which it's explained how Strong became immortal and met Montague, is an entertaining, interesting, and chilling story. It sets up the series perfectly and I'm glad I didn't give up and simply stop reading.
Am now immersed in Book 1 and looking forward to all...how many are there?...22?...novels.