A radical muslim would never be elected though, so what's it matter? What you're saying is you wouldn't let him run in the first place.
Anyway, I'm wondering how long you studied Roman history, because you're wrong. Slaves were NOT made into gladiators unless the committed a crime, and even then it was up to his owner if they would be put into the gladiatorial games or not. Criminals were made into gladiators. Prisoners of war were usually made into slaves. Children of slaves were slaves. Slaves could even earn freedom, or arrange it with their master.