I personally don't believe anymore but no one I work with or interact outside of close friends or my wife would know that. I went to church a lot as a kid and even went to Catholic school for a little while. I think if people believe and they want to celebrate that then they can as much as they want. Religion is helpful to some people and I can appreciate that. It doesn't belong in public schools like they are trying to do here in Texas and have been trying to push for years all over the south for years. It shouldn't be used to make up issues like abortion to keep racists in power, and yes that's inarguably how abortion became and issue in the US.
As for the poster you pointed out I specifically said in real life. Obviously people on both sides argue over the internet. Look I'm sorry an annoying person talked to you in college, but comparing that to harassing people for getting healthcare, or for having different sexual preferences, or not dressing the way they see fit is not only not comparable it happens so much more often and more aggressively than non believers just saying hey I don't think there is a god to a person who does believe.