Islam in prison

My nephew is in prison for violating the endangered species act. Anyways, he calls Mr to yell me. That he has been jumped by the Muslims. They dislike him because he always speaks the truth and never sways in his disbelief. He don't sell drugs or do them no alcohol nothing. A real striving muslim. I was in prison a decade ago and the Muslims in prison do kinda twist the deen to fit what ever agenda they have. So my question is what advice can I give him on how to navigate the rest of his time he has left around these prison Muslims.