Be kind to other human beings. It's not like you were born knowing everything there is to know. I'm very much an atheist and I don't go around calling people with irrational beliefs stupid. All of us believed in something that we later stopped because it ended up not making sense. Leave room for people to learn, grow, and evolve. Attack institutional dogmatism and oppression and bad ideas. Don't belittle the person unless they are harming you.
But you just called them irrational! I'd rather say they have different beliefs. Other than that, I agree that it makes more sense and is more civilized to be respectful of other's beliefs. Attacking one's views tends to just make one hold onto them all the more tightly and so serves no purpose other than to create a greater divide.
Speaking of rational, I'm not sure that anyone is entirely so. I think we operate more on emotion than some of us would like to think.
Thank you! There are some on here that get angry because others believe in things they don't agree with. If they believe the sun is purple, why should I care or even object? I believe there is a lilac bush in my front yard. If some care to not believe, fine. Let it end there instead of getting aggressive.