玄武 can refer to the Black Tortoise (an ancient Chinese constellation of stars- part of the seven mansions of the north sky).

In Daoism, this is the God of the North sky.

This also refers to a Black Tortoise god, said to rule over the northern heavens in Japanese. Can also be pronounced/romanized as genmu or when used as a personal name, Hirotake in Japanese.

上帝是我的法官 is not a traditional Chinese phrase.

We professionally translated it for a customer's request (in proper Chinese grammar).

See Also:   Justice / Rectitude / Right Decision

天 means “heaven” or “sky” in Chinese, Japanese Kanji, and old Korean Hanja.

The context determines if you are talking about heaven or the sky above (often they are the same concept).

When combined with other characters, words like “today” and “tomorrow” are created. While sometimes the character for “sun” is used to mean “day,” often “sky” represents “day” in Asian languages.
Example: 今天 (this sky) = “today,” 明天 (next sky) = “tomorrow” in modern Chinese and Japanese.

In Chinese culture, regardless of which religion, it's almost always assumed that God (and any other deities) live up above the sky. The concept of God living in the sky is likely the reason heaven is associated with this character.
The equation goes something like this: God's domain is the sky, thus, the sky is heaven.

Note: As a single character, this is a little ambiguous, so you might want to choose our Kingdom of Heaven selection instead.

See Also:  Heaven | Never Put Off Until Tomorrow What You Can Do Today | Sun