Now which hadeeth are you going by?
The sunni or shia sect?
God speaks about them here as well:
https://quran.com/29?startingVerse=31
Sorry. What God did was here:
and here:
https://quran.com/29?startingVerse=34
In Hadith, it say they shall be killed if proven what they did.
Discussion
Sunni. Shia who doesn't believe the same things like Sunni aren't considered Muslims.
There is one way, one source and all should follow it. People who decides to believe "alternative" things aren't recognized as Muslims.
But Muslim is someone who follow God, Hadiths are not from God.
If someone follows Hadith his following the words of a Man, not of God (Koran).
God also said in Koran that only he knows what's on people's heart,.so no one can judge on his behalf.