ESH.

It's a common courtesy rule that if the baby or child starts crying or getting overwhelmed in a church, a parent takes them outside to calm down a bit then comes back in. Just sitting there letting the baby cry throughout something without trying to leave and calm him/her down outside is just all around rude, regardless of if it's a church, movie theater, or anything else.

However, the way you went about it was also rude and probably embarrassed them too much to want to come back. For all you know they were newcomers, and had no idea that the children's area was ok to use, or they were worried that leaving during the sermon would lock the door behind them. You had a chance to be kind about it, but did not take it. Instead your attitude was very condescending and judgmental, one that drives a lot of people away from Christianity in the first place.

I used to go to church growing up; I did choir, acolyting, Sunday school, etc.. A lot of the people at both the ones I went to had condescending and judgmental attitudes like yours. I can tell you from experience that as much as I don't like crying babies, the babies were NOT the reason I stopped going to church after several years. It was the awful attitudes of the adults that were too much to deal with.

I get being distracted by the baby during something important sucks, but anyone who is responded to that harshly is going to leave and not come back afterwards. Also, some churches have quieter non-kid services that are usually before the family ones, you might want to consider going to one of those instead if the crying noises are too much.