Stateless Society implies a society WITHOUT a state, so there is no entity to impose sharia law. You might as well ask what is to prevent someone from setting up the burgundian code in a stateless society. Without a State, legal commitments are voluntary, and laws become nothing more than contracts enforced by private authorities.
This nonsense about Sharia-law has been a meme in the post-9/11 USA. It’s not like their are legions of behadings going on in michigan right now.
Muslims are a minority in the US, so they would not have the numbers to enforce ANY legal system.
Judge Andrew Napolitano lays this nonsense to rest on Fox News of all places: https://www.youtube.com/watch?v=t-RGKYdn6fk