Antinomian is quite a negative word. The kind hardly anyone likes to call themselves, even if it was factually correct. Try comparing to bastard, which has a factual meaning (an illegitimate child). Even though being born out of wedlock isn't very shameful nowadays, it's very rare that anyone calls themselves a bastard.
You may find individuals like the blogger Dr. White, who profess to be antinomian -- but even he begins by telling how insulting the word is:
The word “antinomian” is a curse word of the highest degree in the church today. To be charged as an antinomian is to be branded a libertine, careless in morality and one who cheapens the precious blood of our Savior.
Certainly there are antinomian churches, but they avoid using that unpleasant term of themselves.