Why are christians the most intolerant demographic in america?

It's NOT ok for them to harass others into believing, it's not ok for them to cut people off mid- sentence and shove religion down people's throats. Just so you know we are NOT all that way, but also know we Christians are STILL human and we are NOT going to be perfect, even though we think we have the right to judge. We are not model citizens and in no way are we ANYTHING without Jesus our savior. Sometimes we forget we need Jesus and we go off and try and get people to come to Christianity on our own terms. It never works out. However there are some things we believe are just flat out wrong and we CANNOT just be tolerant of them, like sex outside of marriage, homosexuality, however being rude and condescending is out of the question. I wish I could apologize for all those rude Christian's behavior but it's not my place. I hope you can forgive them and try to look at Christians with an open mind. Try to see them as the people they are, broken, with issues and problems that they want God to help them with. That's not all I could say but, I'll stop with that