The fact is that less that probably 1/2 of the people baptized Catholics actually are in any way Catholic..
They may bring their kids for baptism , seek a church to marry or be buried in ...but other than that they are nothing.. and so indeed they do use birth control, have abortions , and support gay rights.. .. but they still call themselves Roman Catholics.. and so they still belong to your church
Kind of like this guy, "Presbyterian minister, father of four, abortion enthusiast"
Non-Presbyterian faction of the Presbyterian Church.