Nah, Dullahan's correct. 人 read as "man", the other kanji split into 王 for "king" and 里 for... probably "country" I guess. More like "Kingdom of Man", I guess, but that's kind of playing hopscotch with the reading.
What I'm saying is that it's not a 40k reference, Nasu's just real into Christian theology and the contrast between the Kingdom of Man vs. Kingdom of Heaven, a.k.a. the Age of Gods, no I haven't ever heard of a "Jimmu" why are you asking, in this dissertation I will