Jesus is one person with two natures. One of His natures is divine (God) and the other is human (man). His God-nature is not His man-nature, and likewise, His man-nature is not His God-nature. They are distinct.
Thus, Christians correctly refer to Jesus as both "God" and also as "man", all the while NEVER referring to God as man or man as God.
This may sound confusing, but it really is not when put into perspective.
Take the following analogy...
John is a person with two automobiles. One of his automobiles is an original, black, Ford Model-T and the other is a red Porsche. His Model-T is not his Porsche, and likewise, his Porsche is not his Model-T. They are distinct.
John could comfortably affirm the following three statements, even though they would appear contradictory to someone who doesn't know John very well:
1. I have a red car.
2. Original Model-Ts are always black.
3. I have an original Model-T.
Likewise, Jesus is both God and man, without God being man or man being God.
God bless you in your exploration of the God-man, Jesus.
"Any customer can have a car painted any color that he wants so long as it is black."
- Henry Ford
What you're claiming (to use your car analogy) is that Jesus is one car which is simultaneously both a red Porsche AND a black Model T.
Like I said, totally incoherent.