What does the term 'Muslim person' even mean? Is every other white politician Christian politician? Is it religion, name, background? This guy is in favor of

What does the term 'Muslim person' even mean? Is every other white politician Christian politician? Is it religion, name, background? This guy is in favor of same sex marriage and received death threats because of it, I doubt he is a Muslim in religious sense, or if he is, then very 'bad' one according to the teachings. Belgium gay beauty contest had a 'first gay muslim' contender. I chuckled when I read it. It is also complicated with term Jewish. Is everyone