Trying to get someone to agree with your political or religious viewpoint, is as futile as trying to convince a mother that her baby isn't the cutest thing ever.
don't attempt to speak a language you can't speak. Going to a market in my 1st night in Spain saying "Quiero polla" instead of "Quiero pollo" was one great lesson! Just 1 letter made the difference-I wanted to say "I want chicken" but said "I want d*ck"!