Do you really think all religious people or all atheists are the same and react the same? That is like saying all women are bad drivers, or all men are sloppy. We have strived in this age for individuality and to be judged as individuals.
I have met very obnoxious Christians who believe they are right and will push it until they drive people the other way. I have also met and read work by atheists who are very "loud" about their distaste and disgust for believers.
You say you get on with your life with a smile on your face yet you choose a graphic that depicts believers as stupid. That in itself is very loud.
I think it comes down to personalities of each person. I am a Christian but quietly so, I will discuss my faith if asked and am glad to do so, but will never push it on anyone--you can't win people over to any belief - whatever it is - by bullying.