There are 6 Ravnica novels. I finished reading the first one and it's really helps draw you into the setting, brings it to life in a way basic descriptions of guilds and noting colours of mana don't.
I recommend reading these 6 books before getting the Ravnica Guildmasters Guide to really get a taste for the Setting. It's really deep and compelling and the first novels feel very D&D to me already, but with a more urban, modern feel.
I look forward to the second novel.
By the way the setting does have gods, for example Orgers have their own gods, although they aren't named.
I recommend reading these 6 books before getting the Ravnica Guildmasters Guide to really get a taste for the Setting. It's really deep and compelling and the first novels feel very D&D to me already, but with a more urban, modern feel.
I look forward to the second novel.
By the way the setting does have gods, for example Orgers have their own gods, although they aren't named.