actually, "神马/神么" is an intentional typo, a "Internet culture" thing in recent years. Many similar examples too.
Literally, "神" doesn't mean "God", "God" in Chinese is "上帝".
I'm a native Chinese.
On the other hand, IMHO, just IMHO, "God" being translated into Chinese(Cantonese) as "神" is not thoughtful as it introduces confusion.