Is this sentence grammatically correct?

[oonter]

"Kami no onchou juubun desu"

[nice gaijin]

what are you trying to say? using romaji makes it tough to figure out. From a glance, I'd say you're either missing a "ga" or "ha" after "onchou."

Assuming you mean to say "The grace of god is enough," I believe "神の恩寵は十分です。" would be correct.

[yamada]

Did you mean 髪の御長は十分です for his/her hair length is much enough ?

[nice gaijin]

lol, a good example of how pointless it is to try to translate from romaji!